In meteorology, precipitation is any product of the condensation of atmospheric water vapor that falls under gravity. The main forms of precipitation include drizzle, sleet, snow and hail. Precipitation occurs when a portion of the atmosphere becomes saturated with water vapor, so that the water condenses and "precipitates", thus and mist are not precipitation but suspensions, because the water vapor does not condense sufficiently to precipitate. Two processes acting together, can lead to air becoming saturated: cooling the air or adding water vapor to the air. Precipitation forms as smaller droplets coalesce via collision with other rain drops or ice crystals within a cloud. Short, intense periods of rain in scattered locations are called "showers."Moisture, lifted or otherwise forced to rise over a layer of sub-freezing air at the surface may be condensed into clouds and rain. This process is active when freezing rain occurs. A stationary front is present near the area of freezing rain and serves as the foci for forcing and rising air.
Provided necessary and sufficient atmospheric moisture content, the moisture within the rising air will condense into clouds, namely stratus and cumulonimbus. The cloud droplets will grow large enough to form raindrops and descend toward the Earth where they will freeze on contact with exposed objects. Where warm water bodies are present, for example due to water evaporation from lakes, lake-effect snowfall becomes a concern downwind of the warm lakes within the cold cyclonic flow around the backside of extratropical cyclones. Lake-effect snowfall can be locally heavy. Thundersnow is possible within lake effect precipitation bands. In mountainous areas, heavy precipitation is possible where upslope flow is maximized within windward sides of the terrain at elevation. On the leeward side of mountains, desert climates can exist due to the dry air caused by compressional heating. Most precipitation is caused by convection; the movement of the monsoon trough, or intertropical convergence zone, brings rainy seasons to savannah climes.
Precipitation is a major component of the water cycle, is responsible for depositing the fresh water on the planet. 505,000 cubic kilometres of water falls as precipitation each year. Given the Earth's surface area, that means the globally averaged annual precipitation is 990 millimetres, but over land it is only 715 millimetres. Climate classification systems such as the Köppen climate classification system use average annual rainfall to help differentiate between differing climate regimes. Precipitation may occur on other celestial bodies, e.g. when it gets cold, Mars has precipitation which most takes the form of frost, rather than rain or snow. Precipitation is a major component of the water cycle, is responsible for depositing most of the fresh water on the planet. 505,000 km3 of water falls as precipitation each year, 398,000 km3 of it over the oceans. Given the Earth's surface area, that means the globally averaged annual precipitation is 990 millimetres. Mechanisms of producing precipitation include convective and orographic rainfall.
Convective processes involve strong vertical motions that can cause the overturning of the atmosphere in that location within an hour and cause heavy precipitation, while stratiform processes involve weaker upward motions and less intense precipitation. Precipitation can be divided into three categories, based on whether it falls as liquid water, liquid water that freezes on contact with the surface, or ice. Mixtures of different types of precipitation, including types in different categories, can fall simultaneously. Liquid forms of precipitation include drizzle. Rain or drizzle that freezes on contact within a subfreezing air mass is called "freezing rain" or "freezing drizzle". Frozen forms of precipitation include snow, ice needles, ice pellets and graupel; the dew point is the temperature to which a parcel must be cooled in order to become saturated, condenses to water. Water vapor begins to condense on condensation nuclei such as dust and salt in order to form clouds. An elevated portion of a frontal zone forces broad areas of lift, which form clouds decks such as altostratus or cirrostratus.
Stratus is a stable cloud deck which tends to form when a cool, stable air mass is trapped underneath a warm air mass. It can form due to the lifting of advection fog during breezy conditions. There are four main mechanisms for cooling the air to its dew point: adiabatic cooling, conductive cooling, radiational cooling, evaporative cooling. Adiabatic cooling occurs when air expands; the air can rise due to convection, large-scale atmospheric motions, or a physical barrier such as a mountain. Conductive cooling occurs when the air comes into contact with a colder surface by being blown from one surface to another, for example from a liquid water surface to colder land. Radiational cooling occurs due to the emission of infrared radiation, either by the air or by the surface underneath. Evaporative cooling occurs when moisture is added to the air through evaporation, which forces the air temperature to cool to its wet-bulb temperature, or until it reaches saturation; the main ways water vapor is added to the air are: wind convergence into areas of upward motion, precipitation or virga falling from above, daytime heating evaporating water from the surface of oceans, water bodies or wet lan
A Mediterranean climate or dry summer climate is characterized by rainy winters and dry summers, with less than 40 mm of precipitation for at least three summer months. While the climate receives its name from the Mediterranean Basin, these are located on the western coasts of continents, between 30 and 45 degrees north and south of the equator between oceanic climates towards the poles, semi-arid and arid climates towards the equator. In essence, due to the seasonal shift of the subtropical high-pressure belts with the apparent movement of the Sun, a Mediterranean climate is an intermediate type between these other climates, with winters warmer and drier than oceanic climates and summers imitating sunny weather in semi-arid and arid climates; the resulting vegetation of Mediterranean climates are the garrigue or maquis in the Mediterranean Basin, the chaparral in California, the fynbos in South Africa, the mallee in Australia, the matorral in Chile. Areas with this climate are where the so-called "Mediterranean trinity" of agricultural products have traditionally developed: wheat and olive.
Most large, historic cities of the Mediterranean basin lie within Mediterranean climatic zones, including Algiers, Beirut, İzmir, Marseille, Rome and Valencia. Examples of major cities with Mediterranean climates that lie outside of the historic Mediterranean basin include major examples as Adelaide, Cape Town, Dushanbe, Los Angeles, Perth, San Francisco and Victoria. Under the Köppen climate classification, "hot dry-summer" climates and "cool dry-summer" climates are referred to as "Mediterranean". Under the Köppen climate system, the first letter indicates the climate group. Temperate climates or "C" zones have an average temperature above 0 °C, but below 18 °C, in their coolest months; the second letter indicates the precipitation pattern. Köppen has defined a dry summer month as a month with less than 30 mm of precipitation and with less than one-third that of the wettest winter month. Some, use a 40 mm level; the third letter indicates the degree of summer heat: "a" represents an average temperature in the warmest month above 22 °C, while "b" indicates the average temperature in the warmest month below 22 °C.
Under the Köppen classification, dry-summer climates occur on the western sides of continents. Csb zones in the Köppen system include areas not associated with Mediterranean climates but with Oceanic climates, such as much of the Pacific Northwest, much of southern Chile, parts of west-central Argentina, parts of New Zealand. Additional highland areas in the subtropics meet Cs requirements, though they, are not associated with Mediterranean climates, as do a number of oceanic islands such as Madeira, the Juan Fernández Islands, the western part of the Canary Islands, the eastern part of the Azores. Under Trewartha's modified Köppen climate classification, the two major requirements for a Cs climate are revised. Under Trewartha's system, at least eight months must have average temperatures of 10 °C or higher, the average annual precipitation must not exceed 900 mm. Thus, under this system, many Csb zones in the Köppen system become Do, the rare Csc zones become Eo, with only the classic dry-summer to warm winter, low annual rainfall locations included in the Mediterranean type climate.
During summer, regions of Mediterranean climate are influenced by cold ocean currents which keep the weather in the region dry and pleasant. Similar to desert climates, in many Mediterranean climates there is a strong diurnal character to daily temperatures in the warm summer months due to strong heating during the day from sunlight and rapid cooling at night. In winter, Mediterranean climate zones are no longer influenced by the cold ocean currents and therefore warmer water settles near land and causes clouds to form and rainfall becomes much more likely; as a result, areas with this climate receive all of their precipitation during their winter and spring seasons, may go anywhere from 3 to 6 months during the summer without having any significant precipitation. In the lower latitudes, precipitation decreases in both the winter and summer because they are closer to the Horse latitudes, thus bringing smaller amounts of rain. Toward the polar latitudes, total moisture increases; the rainfall tends to be more evenly distributed throughout the year in Southern Europe, while in the Eastern Mediterranean and in Southern California the summer is nearly or dry.
In places where evapotranspiration is higher, steppe climates tend to prevail, but still follow the weather pattern of the Mediterranean climate. The majority of the regions with Mediterranean climates have mild winters and warm summers; however winter and summer temperatures can vary between different regions with a Mediterranean climate. For instance, in the case of winters and Los Angeles experience mild temperatures in the winter, with frost and snowfall unknown, whereas Tashkent has colder winters with annual frosts and snowfall. Or to consider summer, Athens experiences rather high temperatures in that season. In contrast, San Francisco has cool summers with daily highs around 21 °C due to
Maharashtra is a state in the western peninsular region of India occupying a substantial portion of the Deccan plateau. It is third-largest state by area in India. Spread over 307,713 km2, it is bordered by the Arabian Sea to the west, the Indian states of Karnataka and Goa to the south and Chhattisgarh to the east and Dadra and Nagar Haveli to the north west, Madhya Pradesh to the north, it is the world's second-most populous subnational entity. It was formed by merging the western and south-western parts of the Bombay State and Vidarbha, the north-western parts of the Hyderabad State and splitting Saurashtra by the States Reorganisation Act, it has over 112 million inhabitants and its capital, has a population around 18 million making it the most populous urban area in India. Nagpur hosts the winter session of the state legislature. Pune is known as'Oxford of the East' due to the presence of several well-known educational institutions; the Godavari and the Krishna are the two major rivers in the state.
The Narmada and Tapi Rivers flow near Madhya Pradesh and Gujarat. Maharashtra is the third-most urbanized state of India. Prior to Indian independence, Maharashtra was chronologically ruled by the Satavahana dynasty, Rashtrakuta dynasty, Western Chalukyas, Deccan sultanates and Marathas, the British. Ruins, tombs and places of worship left by these rulers are dotted around the state, they include the UNESCO World Heritage Sites of the Ellora caves. The numerous forts are associated with the life of Chhatrapati Shivaji Maharaj. Maharashtra is the wealthiest state by all major economic parameters and the most industrialized state in India; the state continues to be the single largest contributor to the national economy with a share of 15% in the country's gross domestic product. Maharashtra accounts for 17% of the industrial output of the country and 16% of the country's service sector output; the economy of Maharashtra is the largest state economy in India with ₹27.96 lakh crore in GDP and a per capita GDP of ₹180,000.
The modern Marathi language developed from the Maharashtri Prakrit, the word Marhatta is found in the Jain Maharashtri literature. The terms Maharashtra, Maharashtri and Maratha may have derived from the same root. However, their exact etymology is uncertain; the most accepted theory among the linguistic scholars is that the words Maratha and Maharashtra derived from a combination of Maha and rashtrika, the name of a tribe or dynasty of petty chiefs ruling in the Deccan region. Another theory is that the term is derived from Maha and ratha / rathi, which refers to a skilful northern fighting force that migrated southward into the area. An alternative theory states that the term derives from Rashtra. However, this theory is somewhat controversial among modern scholars who believe it to be the Sanskritised interpretation of writers. Chalcolithic sites belonging to the Jorwe culture have been discovered throughout the state. Maharashtra was ruled by the Maurya Empire in the fourth and third centuries BCE.
Around 230 BCE, Maharashtra came under the rule of the Satavahana dynasty for 400 years. The greatest ruler of the Satavahana dynasty was Gautamiputra Satakarni. In 90 CE, son of the Satavahana king Satakarni, the "Lord of Dakshinapatha, wielder of the unchecked wheel of Sovereignty", made Junnar, 30 miles north of Pune, the capital of his kingdom; the state was ruled by Western Satraps, Gupta Empire, Gurjara-Pratihara, Kadambas, Chalukya Empire, Rashtrakuta Dynasty, Western Chalukya before the Yadava rule. The Buddhist Ajanta Caves in present-day Aurangabad display influences from the Satavahana and Vakataka style; the caves were excavated during this period. The Chalukya dynasty ruled from the sixth to the eighth centuries CE, the two prominent rulers were Pulakeshin II, who defeated the north Indian Emperor Harsha, Vikramaditya II, who defeated the Arab invaders in the eighth century; the Rashtrakuta dynasty ruled Maharashtra from the eighth to the tenth century. The Arab traveller Sulaiman described the ruler of the Rashtrakuta Dynasty as "one of the four great kings of the world".
Shilahara dynasty began as vassals of the Rashtrakuta dynasty which ruled the Deccan plateau between the eighth and tenth centuries. From the early 11th century to the 12th century, the Deccan Plateau, which includes a significant part of Maharashtra, was dominated by the Western Chalukya Empire and the Chola dynasty. Several battles were fought between the Western Chalukya empire and the Chola dynasty in the Deccan Plateau during the reigns of Raja Raja Chola I, Rajendra Chola I, Jayasimha II, Someshvara I, Vikramaditya VI. In the early 14th century, the Yadava Dynasty, which ruled most of present-day Maharashtra, was overthrown by the Delhi Sultanate ruler Ala-ud-din Khalji. Muhammad bin Tughluq conquered parts of the Deccan, temporarily shifted his capital from Delhi to Daulatabad in Maharashtra. After the collapse of the Tughluqs in 1347, the local Bahmani Sultanate of Gulbarga took over, governing the region for the next 150 years. After the break-up of the Bahamani sultanate in 1518, Maharashtra split into five Deccan Sultanates: Nizamshah of Ahmednagar, Adilshah of Bijapur, Qutubshah of Golkonda, Bidarshah of Bidar and Imadshah of Elichpur.
These kingdoms fought with each other. United, they decisively defeated the
Rajasthan is a state in northern India. The state covers an area of 342,239 square kilometres or 10.4 percent of the total geographical area of India. It is the seventh largest by population. Rajasthan is located on the northwestern side of India, where it comprises most of the wide and inhospitable Thar Desert and shares a border with the Pakistani provinces of Punjab to the northwest and Sindh to the west, along the Sutlej-Indus river valley. Elsewhere it is bordered by five other Indian states: Punjab to the north. Major features include the ruins of the Indus Valley Civilisation at Balathal. Rajasthan is home to three national tiger reserves, the Ranthambore National Park in Sawai Madhopur, Sariska Tiger Reserve in Alwar and Mukundra Hill Tiger Reserve in Kota; the state was formed on 30 March 1949 when Rajputana – the name adopted by the British Raj for its dependencies in the region – was merged into the Dominion of India. Its capital and largest city is Jaipur. Other important cities are Jodhpur, Bikaner and Udaipur.
Rajasthan means "Land of Kings" or "King's Abode". The oldest reference to Rajasthan is found in a stone inscription dated back to 625 A. D; the print mention of the name "Rajasthan" appears in the 1829 publication Annals and Antiquities of Rajast'han or the Central and Western Rajpoot States of India, while the earliest known record of "Rajputana" as a name for the region is in George Thomas's 1800 memoir Military Memories. John Keay, in his book India: A History, stated that "Rajputana" was coined by the British in 1829, John Briggs, translating Ferishta's history of early Islamic India, used the phrase "Rajpoot princes" rather than "Indian princes". Parts of what is now Rajasthan were part of the Vedic Civilisation and Indus Valley Civilization. Kalibangan, in Hanumangarh district, was a major provincial capital of the Indus Valley Civilization.. Another archeological excavation at Balathal site in Udaipur district shows a settlement contemporary with the Harrapan civilization dating back to 3000 - 1500 BC. Stone Age tools dating from 5,000 to 200,000 years were found in Bundi and Bhilwara districts of the state.
Matsya Kingdom of the Vedic civilisation of India, is said to corresponded to the former state of Jaipur in Rajasthan and included the whole of Alwar with portions of Bharatpur. The capital of Matsya was at Viratanagar, said to have been named after its founder king Virata. Bhargava identifies the two districts of Jhunjhunu and Sikar and parts of Jaipur district along with Haryana districts of Mahendragarh and Rewari as part of Vedic state of Brahmavarta. Bhargava locates the present day Sahibi River as the Vedic Drishadwati River, which along with Saraswati River formed the borders of the Vedic state of Brahmavarta. Manu and Bhrigu narrated the Manusmriti to a congregation of seers in this area only. Ashrams of Vedic seers Bhrigu and his son Chayvan Rishi, for whom Chyawanprash was formulated, were near Dhosi Hill part of which lies in Dhosi village of Jhunjhunu district of Rajasthan and part lies in Mahendragarh district of Haryana; the Western Kshatrapas, the Saka rulers of the western part of India, were successors to the Indo-Scythians, were contemporaneous with the Kushans, who ruled the northern part of the Indian subcontinent.
The Indo-Scythians invaded the area of Ujjain and established the Saka era, marking the beginning of the long-lived Saka Western Satraps state. Gurjars ruled for many dynasties in this part of the country, the region was known as Gurjaratra. Up to the 10th century AD all of North India acknowledged the supremacy of the Gurjars, with their seat of power at Kannauj; the Gurjar Pratihar Empire acted as a barrier for Arab invaders from the 8th to the 11th century. The chief accomplishment of the Gurjara-Pratihara Empire lies in its successful resistance to foreign invasions from the west, starting in the days of Junaid. Historian R. C. Majumdar says that this was acknowledged by the Arab writers, he further notes that historians of India have wondered at the slow progress of Muslim invaders in India, as compared with their rapid advance in other parts of the world. Now there seems little doubt that it was the power of the Gurjara Pratihara army that barred the progress of the Arabs beyond the confines of Sindh, their only conquest for nearly 300 years.
Traditionally the Rajputs, Jats, Bhils, Charans, Bishnois, Sermals, PhulMali and other tribes made a great contribution in building the state of Rajasthan. All these tribes suffered great difficulties in protecting the land. Millions of them were killed trying to protect their land. Bhils once ruled Kota. Meenas were rulers of Bundi and the Dhundhar region. Hem Chandra Vikramaditya, the Hindu Emperor, was born in the village of Machheri in Alwar District in 1501, he won 22 battles against Afghans, from Punjab to Bengal including states of Ajmer and Alwar in Rajasthan, defeated Akbar's forces twice at Agra and Delhi in 1556 at Battle of Delhi before acceding to the throne of Delhi and establishing the "Hindu Raj" in North India, albeit for
Kutch district is a district of Gujarat state in western India. Covering an area of 45,674 km², it is the largest district of India; the population of Kutch is about 2,092,000. It has 939 villages and 6 Municipalities; the Kutch district is home to the Kutchi people. Kutch means something which intermittently becomes wet and dry; the same word is used in Sanskrit origin for a tortoise. The Rann is known for its marshy salt flats which become snow white after the shallow water dries up each season before the monsoon rains; the district is known for ecologically important Banni grasslands with their seasonal marshy wetlands which form the outer belt of the Rann of Kutch. Kutch District is surrounded by the Gulf of Kutch and the Arabian Sea in south and west, while northern and eastern parts are surrounded by the Great and Little Rann of Kutch; when there were not many dams built on its rivers, the Rann of Kutch remained wetlands for a large part of the year. Today, the region remains wet for a significant part of year.
The district had a population of 2,092,379 as of 2011 census. Motor vehicles registered in Kutch district have their registration Number starting with GJ-12; the district is well connected by road and air. There are four airports in the district: Naliya, Kandla and Bhuj. Bhuj is well connected with Mumbai airport. Being a border district, Kutch has both an airforce base; the history of Kutch can be traced back to prehistorical times. There are several sites related to Indus valley civilization in region and is mentioned in Hindu mythology. In historical times, Kutch is mentioned in Greek writings during Alexander, it was ruled by Menander I of Greco-Bactrian Kingdom, overthrown by Indo-Scythians followed by Maurya Empire and Sakas. in the first century, it was under Western Satraps followed by Gupta Empire. By fifth century, Maitraka of Valabhi took over from which its close association with ruling clans of Gujarat started. Chavdas ruled the eastern and central parts by seventh century but were came under Chaulukyas by tenth century.
After fall of Chaulukya, Vaghelas ruled the state. Following conquest of Sindh by Muslim rulers, Rajput Samma started moving southwards to Kutch and ruled western regions initially. By tenth century, they controlled significant area of Kutch and by thirteenth century they controlled whole of Kutch and adopted a new dynastic identity, Jadeja. For three centuries, Kutch was ruled by three different branches of Jadeja brothers. In sixteenth century, Kutch was unified under one rule by Rao Khengarji I of these branches and his direct descendants ruled for two centuries and had good relationship with Gujarat Sultanate and Mughals. One of his descendants, Rayadhan II left three sons of whom two died and third son, Pragmal Ji took over the state and founded the current lineage of rulers at the start of the seventeenth century; the descendants of other brothers founded states in Kathiawar. After turbulent periods and battles with armies of Sindh, the state was stabilized in the middle of eighteenth century by council known as Bar Bhayat ni Jamat who placed Rao as a titular head and ruled independently.
The state accepted suzerainty of British East India Company in 1819 when Kutch was defeated in battle. The state was devastated by an earthquake in 1819; the state flourished in business under subsequent rulers. Upon the independence of India in 1947, Kutch acceded unto the dominion of India and was constituted an independent commissionaire, it was created a state within the union of India in 1950. The state witnessed an earthquake in 1956. On 1 November 1956, Kutch State was merged with Bombay state, which in 1960 was divided into the new linguistic states of Gujarat and Maharashtra, with Kutch becoming part of Gujarat state as Kutch district; the district was affected by tropical cyclone in 1998 and the earthquake in 2001. The state saw rapid growth in tourism in subsequent years. Kutch District, at 45,691.895 square kilometres, is the largest district in India. The administrative headquarters is in Bhuj, geographically in the center of district. Other main towns are Gandhidham, Nakhatrana, Mandvi, Madhapar and Bhachau.
Kutch has 969 villages. Kala Dungar is the highest point in Kutch at 458 metres. Kutch is an island, as it is surrounded by the Arabian Sea in the west; the border with Pakistan lies along the northern edge of the Rann of the Sir Creek. The Kutch peninsula is an example of active thrust tectonism. In Central Kutch there are four major east-west hill ranges characterized by fault propagation folds with steeply dipping northern limbs and dipping southern limbs. From the gradual increasing dimension of the linear chain of hillocks towards the west along the Kutch mainland fault and the epicentre of the earthquake of 2001 lying at the eastern extreme of Kutch mainland fault, it is suggested that the eastern part of the Kutch mainland fault is progressively emerging upward, it can be suggested from the absence of distinct surface rupture both during the 1956 Anjar earthquake and 2001 Bhuj earthquake, that movements have taken place along a blind thrust. Villages situated on the blind thrust in the eastern part of the Kutch mainland hill range were erased during the 20
Punjab is a state in northern India. Forming part of the larger Punjab region of the Indian subcontinent, the state is bordered by the Indian states of Jammu and Kashmir to the north, Himachal Pradesh to the east, Haryana to the south and southeast, Rajasthan to the southwest, the Pakistani province of Punjab to the west; the state covers an area of 1.53 % of India's total geographical area. It is the 20th-largest Indian state by area. With 27,704,236 inhabitants at the 2011 census, Punjab is the 16th-largest state by population, comprising 22 districts. Punjabi is the most spoken and official language of the state; the main ethnic group are the Punjabis, with Sikhs forming the demographic majority and Hindus forming a sizable minority. The state capital is Chandigarh, a Union Territory and the capital of the neighbouring state of Haryana; the five rivers from which the region took its name were Sutlej, Beas and Jhelum. The Punjab region was home to the Indus Valley Civilization until 1900 BCE.
The Punjab was invaded by Alexander the Great in 330 BCE and was captured by Chandragupta Maurya under Chanakya. The Punjab was home to the Gupta Empire, the empire of the Alchon Huns, the empire of Harsha, the Mongol Empire. Circa 1000, the Punjab was part of the Delhi Sultanate and Mughal Empire. Sikhism originated in Punjab and resulted in the formation of the Sikh Confederacy after the fall of the Mughal Empire; the confederacy was united into the Sikh Empire by Maharaja Ranjit Singh. The entire Punjab region was annexed by the British East India Company from the Sikh Empire in 1849. In 1947, the Punjab Province of British India was divided along religious lines into West Punjab and East Punjab; the western part was assimilated into new country of Pakistan. The Indian Punjab as well as PEPSU was divided into three parts on the basis of language in 1966. Haryanvi-speaking areas were carved out as Haryana, while the hilly regions and Pahari-speaking areas formed Himachal Pradesh, alongside the current state of Punjab.
Punjab's government has three branches – executive and legislative. Punjab follows the parliamentary system of government with the Chief Minister as the head of the state. Punjab is agriculture-based due to the presence of abundant water sources and fertile soils. Other major industries include the manufacturing of scientific instruments, agricultural goods, electrical goods, financial services, machine tools, sewing machines, sports goods, tourism, bicycles and the processing of pine oil and sugar. Minerals and energy resources contribute to Punjab's economy to a much lesser extent. Punjab has the largest number of steel rolling mill plants in India, which are in "Steel Town"—Mandi Gobindgarh in the Fatehgarh Sahib district; the region was called Sapta Sindhu, the Vedic land of the seven rivers flowing into the ocean. The Sanskrit name for the region, as mentioned in the Ramayana and Mahabharata for example, was Panchanada which means "Land of the Five Rivers", was translated to Persian as Punjab after the Muslim conquests.
The word Punjab is a compound of the Persian words āb. Thus Panjāb means "the land of five rivers"; the five rivers are the Sutlej, Ravi and Jehlum. Traditionally, in English, there used to be a definite article before the name, i.e. "The Punjab". The name is sometimes spelled as "Panjab"; the Greeks called Punjab an inland delta of five converging rivers. During the period when the epic Mahabharata was written, around 800–400 BCE, Punjab was known as Trigarta and ruled by Katoch kings; the Indus Valley Civilization spanned much of the Punjab region with cities such as Ropar. The Vedic Civilization spread along the length of the Sarasvati River to cover most of northern India including Punjab; this civilisation shaped subsequent cultures in the Indian subcontinent. The Punjab region was ruled by many ancient empires including the Gandhara, Mauryas, Kushans, Palas, Gurjara-Pratiharas and Hindu Shahis; the furthest eastern extent of Alexander the Great's exploration was along the Indus River. Agriculture flourished and trading cities such as Jalandhar and Ludhiana grew in wealth.
Due to its location, the Punjab region came under constant attack and influence from both west and east. Punjab faced invasions by the Achaemenids, Scythians and Afghans; this resulted in the Punjab witnessing centuries of bitter bloodshed. Its culture combines Hindu, Islamic and British influences; the original Punjab region is now divided into several units: West Punjab, portions of Khyber-Pakhtunkhwa such as the Gandharar region, the Indian states of Punjab and Himachal Pradesh and the Indian Union territory of Chandigarh and Jammu Division. The Punjab is the'Sapta Sindhu' region mentioned in the Rig Veda, the seven rivers are: Saraswati, Satadru/Shutadri, Asikani, Purushni, Vitasta/Vet and Sindhu. Among the classic books that were wholly or composed in this region are the following. Rigveda Grammar of Sakatayana Ashtadhyayi of Pāṇini Nirukta of Yaska Charaka Samhita Mahabharata along with the Bhagavad Gita Brihatkatha of Gunadya Bakhshali ManuscriptThe world's oldest university Takshashila flourished here before the Buddha's birth.
The Brahmins of this region
Humid continental climate
A humid continental climate is a climatic region defined by Russo-German climatologist Wladimir Köppen in 1900, typified by large seasonal temperature differences, with warm to hot summers and cold winters. Precipitation is distributed throughout the year; the definition of this climate regarding temperature is as follows: the mean temperature of the coldest month must be below −3 °C and there must be at least four months whose mean temperatures are at or above 10 °C. In addition, the location in question must not be arid; the Dfb and Dsb subtypes are known as hemiboreal. Humid continental climates are found between latitudes 40° N and 60° N, within the central and northeastern portions of North America and Asia, they are much less found in the Southern Hemisphere due to the larger ocean area at that latitude and the consequent greater maritime moderation. In the Northern Hemisphere some of the humid continental climates in Scandinavia, Nova Scotia, Newfoundland are maritime-influenced, with cool summers and winters being just below the freezing mark.
More extreme humid continental climates found in northeast China, southern Siberia, the Canadian Prairies, the Great Lakes region of the American Midwest and Central Canada combine hotter summer maxima and colder winters than the marine-based variety. Using the Köppen climate classification, a climate is classified as humid continental when the temperature of the coldest month is below −3 °C and there must be at least four months whose mean temperatures are at or above 10 °C; these temperatures were not arbitrary. In Europe, the −3 °C average temperature isotherm was near the southern extent of winter snowpack; the 10 °C average temperature was found to be the minimum temperature necessary for tree growth. Wide temperature ranges are common within this climate zone. Second letter in the classification symbol defines seasonal rainfall as follows: s: A dry summer—the driest summer month has less than 40 millimetres of rainfall and has less than 1⁄3 the precipitation of the wettest winter month, w: A dry winter—the driest winter month has less than one‑tenth of the precipitation found in the wettest summer month, f: Without dry season—does not meet either of the alternative specifications.while the third letter denotes the extent of summer heat: a: Hot summer, warmest month averages at least 22 °C, b: Warm summer, warmest month averages below 22 °C and at least four months averages above 10 °C.
Within North America, moisture within this climate regime is supplied by the Gulf of Mexico and adjacent western subtropical Atlantic. Precipitation is well distributed year-round in many areas with this climate, while others may see a marked reduction in wintry precipitation, which increases the chances of a wintertime drought. Snowfall occurs in all areas with a humid continental climate and in many such places is more common than rain during the height of winter. In places with sufficient wintertime precipitation, the snow cover is deep. Most summer rainfall occurs during thunderstorms, in North America and Asia an tropical system. Though humidity levels are high in locations with humid continental climates, the "humid" designation means that the climate is not dry enough to be classified as semi-arid or arid. By definition, forests thrive within this climate. Biomes within this climate regime include temperate woodlands, temperate grasslands, temperate deciduous, temperate evergreen forests, coniferous forests.
Within wetter areas, spruce, pine and oak can be found. Fall foliage is noted during the autumn. A hot summer version of a continental climate features an average temperature of at least 22 °C in its warmest month. Since these regimes are limited to the Northern Hemisphere, the warmest month is July or August. For example, Chicago has average July afternoon temperatures near 29 °C, while average January afternoon temperature are near −1 °C. Frost free periods last 4–6 months within this climate regime. Within North America, this climate includes small areas of central and southeast Canada, portions of the central and eastern United States from the 100th meridian eastward to the Atlantic. Precipitation is less seasonally uniform in the west; the western states of the central United States have thermal regimes which fit the Dfa climate type, but are quite dry, are grouped with the steppe climates. In the Eastern Hemisphere, this climate regime is found within interior Eurasia, east-central Asia, parts of India.
Within Europe, the Dfa climate type is present near the Black Sea in southern Ukraine, the Southern Federal District of Russia, southern Moldova, parts of southern Romania, Bulgaria, but tends to be drier and can be semi-arid in these places. In East Asia, this climate exhibits a monsoonal tendency with much higher precipitation in summer than in winter, due the effects of the strong Siberian High much colder winter temperatures than similar latitudes around the world, however with lower snowfall, the exception being western Japan with its heavy snowfall. Tōhoku, between Tokyo and Hokkaidō and Wester