Building material is any material, used for construction purposes. Many occurring substances, such as clay, rocks and wood twigs and leaves, have been used to construct buildings. Apart from occurring materials, many man-made products are in use, some more and some less synthetic; the manufacturing of building materials is an established industry in many countries and the use of these materials is segmented into specific specialty trades, such as carpentry, insulation and roofing work. They provide the make-up of structures including homes. In history there are trends in building materials from being natural to becoming more man-made and composite; these trends tend to increase the initial and long term economic, ecological and social costs of building materials. Initial economic cost of building materials is the purchase price; this is what governs decision making about what materials to use. Sometimes people take into consideration the energy savings or durability of the materials and see the value of paying a higher initial cost in return for a lower lifetime cost.
For example, an asphalt shingle roof costs less than a metal roof to install, but the metal roof will last longer so the lifetime cost is less per year. Some materials may require more care than others, maintaining costs specific to some materials may influence the final decision. Risks when considering lifetime cost of a material is if the building is damaged such as by fire or wind, or if the material is not as durable as advertised; the cost of materials should be taken into consideration to bear the risk to buy combustive materials to enlarge the lifetime. It is said that,'if it must be done, it must be done well'. Pollution costs can be micro; the macro, environmental pollution of extraction industries building materials rely on such as mining and logging produce environmental damage at their source and in transportation of the raw materials, transportation of the products and installation. An example of the micro aspect of pollution is the off-gassing of the building materials in the building or indoor air pollution.
Red List building materials are materials found to be harmful. The carbon footprint, the total set of greenhouse gas emissions produced in the life of the material. A life-cycle analysis includes the reuse, recycling, or disposal of construction waste. Two concepts in building which account for the ecological economics of building materials are green building and sustainable development; the Initial energy costs include the amount of energy consumed to produce and install the material. The long term energy cost is the economic and social costs of continuing to produce and deliver energy to the building for its use and eventual removal; the initial embodied energy of a structure is the energy consumed to extract, deliver, the materials. The lifetime embodied energy continues to grow with the use and reuse/recycling/disposal of the building materials themselves and how the materials and design help minimize the life-time energy consumption of the structure. Social costs are injury and health of the people producing and transporting the materials and potential health problems of the building occupants if there are problems with the building biology.
Globalization has had significant impacts on people both in terms of jobs and self-sufficiency are lost when manufacturing facilities are closed and the cultural aspects of where new facilities are opened. Aspects of fair trade and labor rights are social costs of global building material manufacturing. Brush structures are built from plant parts and were used in primitive cultures such as Native Americans and pygmy peoples in Africa These are built with branches and leaves, bark, similar to a beaver's lodge; these were variously named wikiups, lean-tos, so forth. An extension on the brush building idea is the wattle and daub process in which clay soils or dung cow, are used to fill in and cover a woven brush structure; this gives the structure more thermal strength. Wattle and daub is one of the oldest building techniques. Many older timber frame buildings incorporate wattle and daub as non load bearing walls between the timber frames. Snow and ice, were used by the Inuit peoples for igloos and snow is used to build a shelter called a quinzhee.
Ice has been used for ice hotels as a tourist attraction in northern climates. Clay based buildings come in two distinct types. One being when the walls are made directly with the mud mixture, the other being walls built by stacking air-dried building blocks called mud bricks. Other uses of clay in building is combined with straws to create light clay and daub, mud plaster. Wet-laid, or damp, walls are made by using the mud or clay mixture directly without forming blocks and drying them first; the amount of and type of each material in the mixture used leads to different styles of buildings. The deciding factor is connected with the quality of the soil being used. Larger amounts of clay are employed in building with cob, while low-clay soil is associated with sod house or sod roof construction; the other main ingredients straw/grasses. Rammed earth is both an old and newer take on creating walls, once made by compacting clay soils between planks by hand. Soil, clay, provides good the
Engineers, as practitioners of engineering, are professionals who invent, analyze and test machines, systems and materials to fulfill objectives and requirements while considering the limitations imposed by practicality, regulation and cost. The word engineer is derived from the Latin words ingenium; the foundational qualifications of an engineer include a four-year bachelor's degree in an engineering discipline, or in some jurisdictions, a master's degree in an engineering discipline plus four to six years of peer-reviewed professional practice and passage of engineering board examinations. The work of engineers forms the link between scientific discoveries and their subsequent applications to human and business needs and quality of life. In 1961, the Conference of Engineering Societies of Western Europe and the United States of America defined "professional engineer" as follows: A professional engineer is competent by virtue of his/her fundamental education and training to apply the scientific method and outlook to the analysis and solution of engineering problems.
He/she is able to assume personal responsibility for the development and application of engineering science and knowledge, notably in research, construction, superintending, managing and in the education of the engineer. His/her work is predominantly intellectual and varied and not of a routine mental or physical character, it requires the exercise of original thought and judgement and the ability to supervise the technical and administrative work of others. His/her education will have been such as to make him/her capable of and continuously following progress in his/her branch of engineering science by consulting newly published works on a worldwide basis, assimilating such information and applying it independently. He/she is thus placed in a position to make contributions to the development of engineering science or its applications. His/her education and training will have been such that he/she will have acquired a broad and general appreciation of the engineering sciences as well as thorough insight into the special features of his/her own branch.
In due time he/she will be able to give authoritative technical advice and to assume responsibility for the direction of important tasks in his/her branch. Engineers develop new technological solutions. During the engineering design process, the responsibilities of the engineer may include defining problems and narrowing research, analyzing criteria and analyzing solutions, making decisions. Much of an engineer's time is spent on researching, locating and transferring information. Indeed, research suggests engineers spend 56% of their time engaged in various information behaviours, including 14% searching for information. Engineers must weigh different design choices on their merits and choose the solution that best matches the requirements and needs, their crucial and unique task is to identify and interpret the constraints on a design in order to produce a successful result. Engineers apply techniques of engineering analysis in production, or maintenance. Analytical engineers may supervise production in factories and elsewhere, determine the causes of a process failure, test output to maintain quality.
They estimate the time and cost required to complete projects. Supervisory engineers are responsible for entire projects. Engineering analysis involves the application of scientific analytic principles and processes to reveal the properties and state of the system, device or mechanism under study. Engineering analysis proceeds by separating the engineering design into the mechanisms of operation or failure, analyzing or estimating each component of the operation or failure mechanism in isolation, recombining the components, they may analyze risk. Many engineers use computers to produce and analyze designs, to simulate and test how a machine, structure, or system operates, to generate specifications for parts, to monitor the quality of products, to control the efficiency of processes. Most engineers specialize in one or more engineering disciplines. Numerous specialties are recognized by professional societies, each of the major branches of engineering has numerous subdivisions. Civil engineering, for example, includes structural and transportation engineering and materials engineering include ceramic and polymer engineering.
Mechanical engineering cuts across just about every discipline since its core essence is applied physics. Engineers may specialize in one industry, such as motor vehicles, or in one type of technology, such as turbines or semiconductor materials. Several recent studies have investigated. Research suggests that there are several key themes present in engineers' work: technical work, social work, computer-based work and information behaviours. Among other more detailed findings, a recent work sampling study found that engineers spend 62.92% of their time engaged in technical work, 40.37% in social work, 49.66% in computer-based work. Furthermore, there was considerable overlap between these different types of work, with engineers spending 24.96% of their time engaged in technical and social work, 37.97% in technical and non-social, 15.42% in non-technical and social, 21.66% in non-technical and non-social. Engineering is an information-intensive field, with research finding that engineers spend 55
Spain the Kingdom of Spain, is a country located in Europe. Its continental European territory is situated on the Iberian Peninsula, its territory includes two archipelagoes: the Canary Islands off the coast of Africa, the Balearic Islands in the Mediterranean Sea. The African enclaves of Ceuta, Peñón de Vélez de la Gomera make Spain the only European country to have a physical border with an African country. Several small islands in the Alboran Sea are part of Spanish territory; the country's mainland is bordered to the south and east by the Mediterranean Sea except for a small land boundary with Gibraltar. With an area of 505,990 km2, Spain is the largest country in Southern Europe, the second largest country in Western Europe and the European Union, the fourth largest country in the European continent. By population, Spain is the fifth in the European Union. Spain's capital and largest city is Madrid. Modern humans first arrived in the Iberian Peninsula around 35,000 years ago. Iberian cultures along with ancient Phoenician, Greek and Carthaginian settlements developed on the peninsula until it came under Roman rule around 200 BCE, after which the region was named Hispania, based on the earlier Phoenician name Spn or Spania.
At the end of the Western Roman Empire the Germanic tribal confederations migrated from Central Europe, invaded the Iberian peninsula and established independent realms in its western provinces, including the Suebi and Vandals. The Visigoths would forcibly integrate all remaining independent territories in the peninsula, including Byzantine provinces, into the Kingdom of Toledo, which more or less unified politically and all the former Roman provinces or successor kingdoms of what was documented as Hispania. In the early eighth century the Visigothic Kingdom fell to the Moors of the Umayyad Islamic Caliphate, who arrived to rule most of the peninsula in the year 726, leaving only a handful of small Christian realms in the north and lasting up to seven centuries in the Kingdom of Granada; this led to many wars during a long reconquering period across the Iberian Peninsula, which led to the creation of the Kingdom of Leon, Kingdom of Castile, Kingdom of Aragon and Kingdom of Navarre as the main Christian kingdoms to face the invasion.
Following the Moorish conquest, Europeans began a gradual process of retaking the region known as the Reconquista, which by the late 15th century culminated in the emergence of Spain as a unified country under the Catholic Monarchs. Until Aragon had been an independent kingdom, which had expanded toward the eastern Mediterranean, incorporating Sicily and Naples, had competed with Genoa and Venice. In the early modern period, Spain became the world's first global empire and the most powerful country in the world, leaving a large cultural and linguistic legacy that includes more than 570 million Hispanophones, making Spanish the world's second-most spoken native language, after Mandarin Chinese. During the Golden Age there were many advancements in the arts, with world-famous painters such as Diego Velázquez; the most famous Spanish literary work, Don Quixote, was published during the Golden Age. Spain hosts the world's third-largest number of UNESCO World Heritage Sites. Spain is a secular parliamentary democracy and a parliamentary monarchy, with King Felipe VI as head of state.
It is a major developed country and a high income country, with the world's fourteenth largest economy by nominal GDP and sixteenth largest by purchasing power parity. It is a member of the United Nations, the European Union, the Eurozone, the Council of Europe, the Organization of Ibero-American States, the Union for the Mediterranean, the North Atlantic Treaty Organization, the Organisation for Economic Co-operation and Development, Organization for Security and Co-operation in Europe, the Schengen Area, the World Trade Organization and many other international organisations. While not an official member, Spain has a "Permanent Invitation" to the G20 summits, participating in every summit, which makes Spain a de facto member of the group; the origins of the Roman name Hispania, from which the modern name España was derived, are uncertain due to inadequate evidence, although it is documented that the Phoenicians and Carthaginians referred to the region as Spania, therefore the most accepted etymology is a Semitic-Phoenician one.
Down the centuries there have been a number of accounts and hypotheses: The Renaissance scholar Antonio de Nebrija proposed that the word Hispania evolved from the Iberian word Hispalis, meaning "city of the western world". Jesús Luis Cunchillos argues that the root of the term span is the Phoenician word spy, meaning "to forge metals". Therefore, i-spn-ya would mean "the land where metals are forged", it may be a derivation of the Phoenician I-Shpania, meaning "island of rabbits", "land of rabbits" or "edge", a reference to Spain's location at the end of the Mediterranean. The word in question means "Hyrax" due to Phoenicians confusing the two animals. Hispania may derive from the poetic use of the term Hesperia, reflecting the Greek perception of Italy as a "western land" or "land of the setting sun" (Hesperia
Royal BAM Group
Koninklijke BAM Groep is a Dutch construction-services business with headquarters in Bunnik, Netherlands. The company was founded by Adam van der Wal as a joiner's shop in 1869, it was renamed Bataafsche Aanneming Maatschappij van Bouw- en Betonwerken in 1927 and expanded through acquisition buying Interbuild in 1998, NBM-Amstelland in 2000 and Hollandsche Beton Groep in 2002. The company's major operations include: BAM Utiliteitsbouw - Non-residential construction BAM Woningbouw - Residential construction BAM Civil - Civil engineering BAM Infratechniek - Utilities BAM Wegen - Environmental engineering BAM Ritchies - geotechnical BAM Construct UK BAM Sports - Sports venues, headquartered in Germany BAM Nuttall - Civil engineering in the UK BAM Contractors - Building, Civil Engineering, Facilities Management, PPP, Property and Rail in Ireland BAM International - Marine, Building, Civil Engineering Construction outside of Europe Projects completed by the company include the Amsterdam Arena football stadium for AFC Ajax in Amsterdam completed in 1996, the Antwerp Law Courts completed in 2005 and the Euroborg football stadium for FC Groningen in Groningen completed in 2006.
The company was part of the Infraspeed consortium which handed over the HSL-Zuid high-speed railway line for commercial use in 2009. Media related to Royal BAM Group at Wikimedia Commons Official website
An airport is an aerodrome with extended facilities for commercial air transport. Airports have facilities to store and maintain aircraft, a control tower. An airport consists of a landing area, which comprises an aerially accessible open space including at least one operationally active surface such as a runway for a plane to take off or a helipad, includes adjacent utility buildings such as control towers and terminals. Larger airports may have airport aprons, taxiway bridges, air traffic control centres, passenger facilities such as restaurants and lounges, emergency services. In some countries, the US in particular, they typically have one or more fixed-base operators, serving general aviation. An airport serving helicopters is called a heliport. An airport for use by seaplanes and amphibious aircraft is called a seaplane base; such a base includes a stretch of open water for takeoffs and landings, seaplane docks for tying-up. An international airport has additional facilities for customs and passport control as well as incorporating all of the aforementioned elements.
Such airports rank among the most complex and largest of all built typologies with 15 of the top 50 buildings by floor area being airport terminals. The terms aerodrome and airstrip may be used to refer to airports, the terms heliport, seaplane base, STOLport refer to airports dedicated to helicopters, seaplanes, or short take-off and landing aircraft. In colloquial use in certain environments, the terms airport and aerodrome are interchanged. However, in general, the term airport may imply or confer a certain stature upon the aviation facility that other aerodromes may not have achieved. In some jurisdictions, airport is a legal term of art reserved for those aerodromes certified or licensed as airports by the relevant national aviation authority after meeting specified certification criteria or regulatory requirements; that is to say, all airports are aerodromes, but not all aerodromes are airports. In jurisdictions where there is no legal distinction between aerodrome and airport, which term to use in the name of an aerodrome may be a commercial decision.
In United States technical/legal usage, landing area is used instead of aerodrome, airport means "a landing area used by aircraft for receiving or discharging passengers or cargo". Smaller or less-developed airfields, which represent the vast majority have a single runway shorter than 1,000 m. Larger airports for airline flights have paved runways of 2,000 m or longer. Skyline Airport in Inkom, Idaho has a runway, only 122 m long. In the United States, the minimum dimensions for dry, hard landing fields are defined by the FAR Landing And Takeoff Field Lengths; these include considerations for safety margins during takeoff. The longest public-use runway in the world is at Qamdo Bamda Airport in China, it has a length of 5,500 m. The world's widest paved runway is 105 m wide; as of 2009, the CIA stated that there were 44,000 "... airports or airfields recognizable from the air" around the world, including 15,095 in the US, the US having the most in the world. Most of the world's large airports are owned by local, regional, or national government bodies who lease the airport to private corporations who oversee the airport's operation.
For example, in the United Kingdom the state-owned British Airports Authority operated eight of the nation's major commercial airports – it was subsequently privatized in the late 1980s, following its takeover by the Spanish Ferrovial consortium in 2006, has been further divested and downsized to operating just Heathrow now. Germany's Frankfurt Airport is managed by the quasi-private firm Fraport. While in India GMR Group operates, through joint ventures, Indira Gandhi International Airport and Rajiv Gandhi International Airport. Bengaluru International Airport and Chhatrapati Shivaji International Airport are controlled by GVK Group; the rest of India's airports are managed by the Airports Authority of India. In Pakistan nearly all civilian airports are owned and operated by the Pakistan Civil Aviation Authority except for Sialkot International Airport which has the distinction of being the first owned public airport in Pakistan and South Asia. In the United States, commercial airports are operated directly by government entities or government-created airport authorities, such as the Los Angeles World Airports authority that oversees several airports in the Greater Los Angeles area, including Los Angeles International Airport.
In Canada, the federal authority, Transport Canada, divested itself of all but the remotest airports in 1999/2000. Now most airports in Canada are owned and operated by individual legal authorities or are municipally owned. Many U. S. airports still lease part or all of their facilities to outside firms, who operate functions such as retail management and parking. In the U. S. all commercial airport runways are certified by the FAA under the Code of Federal Regulations Title 14 Part 139, "Certification of Commercial Service Airports" but maintained by the local airport under the regulatory authority of the FAA. Despite the reluctance to privatize airports in the US, the government-owned, contractor-operated arrangement is the standard for the operation of commercial airports in the rest of the world. Airports are divided into airside areas; the landside area is open to the public, while access to the airside area is controlled. The airside area includes all parts of the airpo
Manhattan referred to locally as the City, is the most densely populated of the five boroughs of New York City and its economic and administrative center, cultural identifier, historical birthplace. The borough is coextensive with New York County, one of the original counties of the U. S. state of New York. The borough consists of Manhattan Island, bounded by the Hudson and Harlem rivers. S. mainland, physically connected to the Bronx and separated from the rest of Manhattan by the Harlem River. Manhattan Island is divided into three informally bounded components, each aligned with the borough's long axis: Lower and Upper Manhattan. Manhattan has been described as the cultural, financial and entertainment capital of the world, the borough hosts the United Nations Headquarters. Anchored by Wall Street in the Financial District of Lower Manhattan, New York City has been called both the most economically powerful city and the leading financial center of the world, Manhattan is home to the world's two largest stock exchanges by total market capitalization: the New York Stock Exchange and NASDAQ.
Many multinational media conglomerates are based in Manhattan, the borough has been the setting for numerous books and television shows. Manhattan real estate has since become among the most expensive in the world, with the value of Manhattan Island, including real estate, estimated to exceed US$3 trillion in 2013. Manhattan traces its origins to a trading post founded by colonists from the Dutch Republic in 1624 on Lower Manhattan. Manhattan is documented to have been purchased by Dutch colonists from Native Americans in 1626 for 60 guilders, which equals $1038 in current terms; the territory and its surroundings came under English control in 1664 and were renamed New York after King Charles II of England granted the lands to his brother, the Duke of York. New York, based in present-day Manhattan, served as the capital of the United States from 1785 until 1790; the Statue of Liberty greeted millions of immigrants as they came to the Americas by ship in the late 19th and early 20th centuries and is a world symbol of the United States and its ideals of liberty and peace.
Manhattan became a borough during the consolidation of New York City in 1898. New York County is the United States' second-smallest county by land area, is the most densely populated U. S. county. It is one of the most densely populated areas in the world, with a census-estimated 2017 population of 1,664,727 living in a land area of 22.83 square miles, or 72,918 residents per square mile, higher than the density of any individual U. S. city. On business days, the influx of commuters increases this number to over 3.9 million, or more than 170,000 people per square mile. Manhattan has the third-largest population of New York City's five boroughs, after Brooklyn and Queens, is the smallest borough in terms of land area. Manhattan Island is informally divided into three areas, each aligned with its long axis: Lower and Upper Manhattan. Many districts and landmarks in Manhattan are well known, as New York City received a record 62.8 million tourists in 2017, Manhattan hosts three of the world's 10 most-visited tourist attractions in 2013: Times Square, Central Park, Grand Central Terminal.
The borough hosts many prominent bridges, such as the Brooklyn Bridge. Chinatown incorporates the highest concentration of Chinese people in the Western Hemisphere, the Stonewall Inn in Greenwich Village, part of the Stonewall National Monument, is considered the birthplace of the modern gay rights movement; the City of New York was founded at the southern tip of Manhattan, the borough houses New York City Hall, the seat of the city's government. Numerous colleges and universities are located in Manhattan, including Columbia University, New York University, Cornell Tech, Weill Cornell Medical College, Rockefeller University, which have been ranked among the top 40 in the world; the name Manhattan derives from the Munsee dialect of the Lenape language'manaháhtaan'. The Lenape word has been translated as "the place where we get bows" or "place for gathering the bows". According to a Munsee tradition recorded in the 19th century, the island was named so for a grove of hickory trees at the lower end, considered ideal for the making of bows.
It was first recorded in writing as Manna-hata, in the 1609 logbook of Robert Juet, an officer on Henry Hudson's yacht Halve Maen. A 1610 map depicts the name as Manna-hata, twice, on both the west and east sides of the Mauritius River. Alternative folk etymologies include "island of many hills", "the island where we all became intoxicated" and "island", as well as a phrase descriptive of the whirlpool at Hell Gate; the area, now Manhattan was long inhabited by the Lenape Native Americans. In 1524, Florentine explorer Giovanni da Verrazzano – sailing in service of King Francis I of France – became the first documented European to visit the area that would become New York City, he entered the tidal strait now known as The Narrows and named the land around Upper New York
France the French Republic, is a country whose territory consists of metropolitan France in Western Europe and several overseas regions and territories. The metropolitan area of France extends from the Mediterranean Sea to the English Channel and the North Sea, from the Rhine to the Atlantic Ocean, it is bordered by Belgium and Germany to the northeast and Italy to the east, Andorra and Spain to the south. The overseas territories include French Guiana in South America and several islands in the Atlantic and Indian oceans; the country's 18 integral regions span a combined area of 643,801 square kilometres and a total population of 67.3 million. France, a sovereign state, is a unitary semi-presidential republic with its capital in Paris, the country's largest city and main cultural and commercial centre. Other major urban areas include Lyon, Toulouse, Bordeaux and Nice. During the Iron Age, what is now metropolitan France was inhabited by a Celtic people. Rome annexed the area in 51 BC, holding it until the arrival of Germanic Franks in 476, who formed the Kingdom of Francia.
The Treaty of Verdun of 843 partitioned Francia into Middle Francia and West Francia. West Francia which became the Kingdom of France in 987 emerged as a major European power in the Late Middle Ages following its victory in the Hundred Years' War. During the Renaissance, French culture flourished and a global colonial empire was established, which by the 20th century would become the second largest in the world; the 16th century was dominated by religious civil wars between Protestants. France became Europe's dominant cultural and military power in the 17th century under Louis XIV. In the late 18th century, the French Revolution overthrew the absolute monarchy, established one of modern history's earliest republics, saw the drafting of the Declaration of the Rights of Man and of the Citizen, which expresses the nation's ideals to this day. In the 19th century, Napoleon established the First French Empire, his subsequent Napoleonic Wars shaped the course of continental Europe. Following the collapse of the Empire, France endured a tumultuous succession of governments culminating with the establishment of the French Third Republic in 1870.
France was a major participant in World War I, from which it emerged victorious, was one of the Allies in World War II, but came under occupation by the Axis powers in 1940. Following liberation in 1944, a Fourth Republic was established and dissolved in the course of the Algerian War; the Fifth Republic, led by Charles de Gaulle, remains today. Algeria and nearly all the other colonies became independent in the 1960s and retained close economic and military connections with France. France has long been a global centre of art and philosophy, it hosts the world's fourth-largest number of UNESCO World Heritage Sites and is the leading tourist destination, receiving around 83 million foreign visitors annually. France is a developed country with the world's sixth-largest economy by nominal GDP, tenth-largest by purchasing power parity. In terms of aggregate household wealth, it ranks fourth in the world. France performs well in international rankings of education, health care, life expectancy, human development.
France is considered a great power in global affairs, being one of the five permanent members of the United Nations Security Council with the power to veto and an official nuclear-weapon state. It is a leading member state of the European Union and the Eurozone, a member of the Group of 7, North Atlantic Treaty Organization, Organisation for Economic Co-operation and Development, the World Trade Organization, La Francophonie. Applied to the whole Frankish Empire, the name "France" comes from the Latin "Francia", or "country of the Franks". Modern France is still named today "Francia" in Italian and Spanish, "Frankreich" in German and "Frankrijk" in Dutch, all of which have more or less the same historical meaning. There are various theories as to the origin of the name Frank. Following the precedents of Edward Gibbon and Jacob Grimm, the name of the Franks has been linked with the word frank in English, it has been suggested that the meaning of "free" was adopted because, after the conquest of Gaul, only Franks were free of taxation.
Another theory is that it is derived from the Proto-Germanic word frankon, which translates as javelin or lance as the throwing axe of the Franks was known as a francisca. However, it has been determined that these weapons were named because of their use by the Franks, not the other way around; the oldest traces of human life in what is now France date from 1.8 million years ago. Over the ensuing millennia, Humans were confronted by a harsh and variable climate, marked by several glacial eras. Early hominids led a nomadic hunter-gatherer life. France has a large number of decorated caves from the upper Palaeolithic era, including one of the most famous and best preserved, Lascaux. At the end of the last glacial period, the climate became milder. After strong demographic and agricultural development between the 4th and 3rd millennia, metallurgy appeared at the end of the 3rd millennium working gold and bronze, iron. France has numerous megalithic sites from the Neolithic period, including the exceptiona