1.
Madeira
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Madeira is a Portuguese archipelago situated in the north Atlantic Ocean, southwest of Portugal. Its total population was estimated in 2011 at 267,785, the capital of Madeira is Funchal, located on the main islands south coast. The archipelago is just under 400 kilometres north of Tenerife, Canary Islands, since 1976, the archipelago has been one of the two Autonomous regions of Portugal. It includes the islands of Madeira, Porto Santo, and the Desertas, the region has political and administrative autonomy through the Administrative Political Statue of the Autonomous Region of Madeira provided for in the Portuguese Constitution. Madeira was claimed by Portuguese sailors in the service of Prince Henry the Navigator in 1419, the archipelago is considered to be the first territorial discovery of the exploratory period of the Portuguese Age of Discovery, which extended from 1415 to 1542. Today, it is a popular resort, being visited every year by about one million tourists. The region is noted for its Madeira wine, gastronomy, historical and cultural value, its flora and fauna, landscapes which are classified as a UNESCO World Heritage Site and embroidery artisans. Its annual New Year celebrations feature the largest fireworks show in the world, Madeira is the second richest region of Portugal by GDP per capita, only surpassed by Lisbon. They are called the Isles of the Blessed, archeological evidence suggests that the islands may have been visited by the Vikings sometime between 900-1030. During the reign of King Edward III of England, lovers Robert Machim and they were driven off their course by a violent storm and their ship went aground along the coast of an island, that may have been Madeira. Later this legend was the basis of the naming of the city of Machico, knowledge of some Atlantic islands, such as Madeira, existed before their formal discovery and settlement, as the islands were shown on maps as early as 1339. The following year, an expedition, under the captaincy of Zarco, Vaz Teixeira. Subsequently, the new settlers observed a black cloud suspended to the southwest. Their investigation revealed it to be the island they called Madeira. The first Portuguese settlers began colonizing the islands around 1420 or 1425, grain production began to fall and the ensuing crisis forced Henry the Navigator to order other commercial crops to be planted so that the islands could be profitable. The planting of sugarcane, and later Sicilian sugar beet, allowed the introduction of the salt into Europe. These specialised plants, and their associated industrial technology, created one of the major revolutions on the islands, the expansion of sugar plantations in Madeira began in 1455, using advisers from Sicily and financed by Genoese capital. The accessibility of Madeira attracted Genoese and Flemish traders, who were keen to bypass Venetian monopolies, by 1480 Antwerp had some seventy ships engaged in the Madeira sugar trade, with the refining and distribution concentrated in Antwerp
2.
Irrigation sprinkler
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Irrigation sprinklers are sprinklers providing irrigation to agriculture, crops, vegetation, or for recreation, as a cooling system, or for the control of airborne dust, landscaping and golf courses. The sprinkler system irrigates the field and thus it is used in sandy areas as it checks the wastage of water through seepage. Sprinkler irrigation is a method of applying irrigation water which is similar to natural rainfall, water is distributed through a system of pipes usually by pumping. It is then sprayed into the air through sprinklers so that it breaks up into small water drops which fall to the ground, the pump supply system, sprinklers and operating conditions must be designed to enable a uniform application of water. Sprinklers that spray in a fixed pattern are generally called sprays or spray heads, sprays are not usually designed to operate at pressures, due to misting problems that may develop. Higher pressure sprinklers that themselves move in a circle are driven by a drive, gear drive. These can be designed to rotate in a full or partial circle.5 to 1.9 inches, in addition to irrigation, guns are used for industrial applications such as dust suppression and logging. Many irrigation sprinklers are buried in the ground along with their plumbing, although above ground. Most irrigation sprinklers operate through electric and hydraulic technology and are grouped together in zones that can be turned on. Home lawn sprinklers vary widely in their size, cost, and they include impact sprinklers, oscillating sprinklers, drip sprinklers, and underground sprinkler systems. Small sprinklers are available at home and garden stores or hardware stores for small costs and these are often attached to an outdoor water faucet and are placed only temporarily. Other systems may be installed permanently in the ground and are attached permanently to a homes plumbing system. An ingenious domestic sprinkler made by Nomad called a set-and-forget tractor sprinkler was used in Australia in the 1950s, water pressure ensured that the sprinkler slowly moved across a lawn. Permanently installed systems may operate on timers or other automated processes. They are occasionally installed with retractable heads for aesthetic and practical reasons and these often are programmed to operate on a schedule and irrigate a piece of land in zones. Underground sprinklers function through means of electronic and hydraulic technology. This valve and all of the sprinklers that will be activated by this valve are known as a zone, upon activation, the solenoid, which sits on top of the valve is magnetized lifting a small stainless steel plunger in its center. By doing this, the activated plunger allows air to escape from the top of a diaphragm located in the center of the valve
3.
Garden
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A garden is a planned space, usually outdoors, set aside for the display, cultivation, and enjoyment of plants and other forms of nature. The garden can incorporate both natural and man-made materials, the most common form today is known as a residential garden, but the term garden has traditionally been a more general one. Zoos, which wild animals in simulated natural habitats, were formerly called zoological gardens. Western gardens are almost universally based on plants, with garden often signifying a shortened form of botanical garden, some traditional types of eastern gardens, such as Zen gardens, use plants sparsely or not at all. Xeriscape gardens use local plants that do not require irrigation or extensive use of other resources while still providing the benefits of a garden environment. Gardens may exhibit structural enhancements, sometimes called follies, including features such as fountains, ponds, waterfalls or creeks, dry creek beds, statuary, arbors, trellises. Some gardens are for ornamental purposes only, while some also produce food crops, sometimes in separate areas. Food-producing gardens are distinguished from farms by their scale, more labor-intensive methods. Flower gardens combine plants of different heights, colors, textures, Gardening is the activity of growing and maintaining the garden. This work is done by an amateur or professional gardener, a gardener might also work in a non-garden setting, such as a park, a roadside embankment, or other public space. Landscape architecture is a professional activity with landscape architects tending to specialise in design for public. See Grad for more complete etymology, the words yard, court, and Latin hortus, are cognates—all referring to an enclosed space. The term garden in British English refers to an enclosed area of land. This would be referred to as a yard in American English, garden design is the creation of plans for the layout and planting of gardens and landscapes. Gardens may be designed by garden owners themselves, or by professionals, professional garden designers tend to be trained in principles of design and horticulture, and have a knowledge and experience of using plants. Some professional garden designers are also landscape architects, a formal level of training that usually requires an advanced degree. Garden design can be divided into two groups, formal and naturalistic gardens. All of these considerations are subject to the limitations of the budget, most gardens consist of a mix of natural and constructed elements, although even very natural gardens are always an inherently artificial creation
4.
Fertilizer
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A fertilizer or fertiliser is any material of natural or synthetic origin that is applied to soils or to plant tissues to supply one or more plant nutrients essential to the growth of plants. Fertilizers enhance the growth of plants and this goal is met in two ways, the traditional one being additives that provide nutrients. The second mode by which some fertilizers act is to enhance the effectiveness of the soil by modifying its water retention and aeration and this article, like many on fertilizers, emphasises the nutritional aspect. The nutrients required for plant life are classified according to the elements. Instead compounds containing these elements are the basis of fertilizers, the macronutrients are consumed in larger quantities and are present in plant tissue in quantities from 0. 15% to 6. 0% on a dry matter basis. Plants are made up of four elements, hydrogen, oxygen, carbon. Carbon, hydrogen and oxygen are widely available as water and carbon dioxide, although nitrogen makes up most of the atmosphere, it is in a form that is unavailable to plants. Nitrogen is the most important fertilizer since nitrogen is present in proteins, DNA, to be nutritious to plants, nitrogen must be made available in a fixed form. Only some bacteria and their host plants can fix atmospheric nitrogen by converting it to ammonia, phosphate is required for the production of DNA and ATP, the main energy carrier in cells, as well as certain lipids. Micronutrients are consumed in quantities and are present in plant tissue on the order of parts-per-million, ranging from 0.15 to 400 ppm DM. These elements are present at the active sites of enzymes that carry out the plants metabolism. Because these elements enable catalysts their impact far exceeds their weight percentage, Fertilizers are classified in several ways. They are classified according to whether they provide a single nutrient, multinutrient fertilizers provide two or more nutrients, for example N and P. Fertilizers are also sometimes classified as inorganic versus organic. Inorganic fertilizers exclude carbon-containing materials except ureas, organic fertilizers are usually plant- or animal-derived matter. Inorganic are sometimes called synthetic fertilizers since various chemical treatments are required for their manufacture, the main nitrogen-based straight fertilizer is ammonia or its solutions. Ammonium nitrate is widely used. Urea is another source of nitrogen, having the advantage that it is solid and non-explosive, unlike ammonia and ammonium nitrate. A few percent of the fertilizer market has been met by calcium ammonium nitrate
5.
Mulch
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A mulch is a layer of material applied to the surface of an area of soil. It may be permanent or temporary and it may be applied to bare soil, or around existing plants. Mulches of manure or compost will be incorporated naturally into the soil by the activity of worms, the process is used both in commercial crop production and in gardening, and when applied correctly can dramatically improve soil productivity. Many materials are used as mulches, which are used to retain moisture, regulate soil temperature, suppress weed growth. They are applied to the surface, around trees, paths, flower beds, to prevent soil erosion on slopes. Mulch layers are two inches or more deep when applied. They are applied at times of the year depending on the purpose. Towards the beginning of the growing season mulches serve initially to warm the soil by helping it retain heat which is lost during the night and this allows early seeding and transplanting of certain crops, and encourages faster growth. As the season progresses, mulch stabilizes the temperature and moisture. The effect of mulch upon soil moisture content is complex, Mulch forms a layer between the soil and the atmosphere which prevents sunlight from reaching the soil surface, thus reducing evaporation. However, mulch can prevent water from reaching the soil by absorbing or blocking water from light rains. As it decays and enriches the soils, I add more, plastic mulch used in large-scale commercial production is laid down with a tractor-drawn or standalone layer of plastic mulch. This is usually part of a mechanical process, where raised beds are formed, plastic is rolled out on top. Drip irrigation is required, with drip tape laid under the plastic. Materials used as mulches vary and depend on a number of factors, many of these materials also act as a direct composting system, such as the mulched clippings of a mulching lawn mower, or other organics applied as sheet composting. Compost, fully composted materials are used to avoid possible phytotoxicity problems, materials that are free of seeds are ideally used, to prevent weeds being introduced by the mulch. Old carpet, makes a free, readily available mulch, Rubber mulch, made from recycled tire rubber. Plastic mulch, crops grow through slits or holes in plastic sheeting
6.
Garden design
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Garden design is the art and process of designing and creating plans for layout and planting of gardens and landscapes. Garden design may be done by the owner themselves, or by professionals of varying levels of experience. All of these considerations are subject to the limitations of the prescribed budget, a gardens location can have a substantial influence on its design. The soils of the site will affect what types of plant may be grown, as will the gardens climate zone, the locational context of the garden can also influence its design, for example an urban setting may require a different design style to a rural one. Similarly, a coastal location may necessitate a different treatment compared to a sheltered inland site. The quality of a soil can have a significant influence on a gardens design. However soils may be replaced or improved in order to them more suitable. Traditionally, garden soil is improved by amendment, the process of adding beneficial materials to the native subsoil and particularly the topsoil. The added materials, which may consist of compost, peat, sand, mineral dust, or manure, among others, are mixed with the soil to the preferred depth. The amount and type of amendment may depend on many factors, including the amount of existing soil humus, the structure, the soil acidity/alkalinity. One source states that, conditioning the soil thoroughly before planting enables the plants to establish themselves quickly, however, not all gardens are, or should be, amended in this manner, since many plants prefer an impoverished soil. In this case, poor soil is better than a soil that has been artificially enriched. The design of a garden can be affected by the nature of its boundaries, planting can be used to modify an existing boundary line by softening or widening it. Introducing internal boundaries can help divide or break up a garden into smaller areas, the main types of boundary within a garden are hedges, walls and fences. A hedge may be evergreen or deciduous, formal or informal, short or tall, depending on the style of the garden and purpose of the boundary. A wall has a strong foundation beneath it at all points, a fence differs from a wall in that it is anchored only at intervals, and is usually constructed using wood or metal. In temperate western gardens, an expanse of lawn is often considered essential to a garden. However garden designers may use other surfaces, for example those made up of gravel, small pebbles, or wood chips in order to create a different appearance
7.
Rain
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Rain is liquid water in the form of droplets that have condensed from atmospheric water vapor and then precipitated—that is, become heavy enough to fall under gravity. Rain is a component of the water cycle and is responsible for depositing most of the fresh water on the Earth. It provides suitable conditions for many types of ecosystems, as well as water for power plants. The major cause of production is moisture moving along three-dimensional zones of temperature and moisture contrasts known as weather fronts. If enough moisture and upward motion is present, precipitation falls from convective clouds such as cumulonimbus which can organize into narrow rainbands. On the leeward side of mountains, desert climates can exist due to the dry air caused by downslope flow which causes heating and drying of the air mass, the movement of the monsoon trough, or intertropical convergence zone, brings rainy seasons to savannah climes. The urban heat island effect leads to increased rainfall, both in amounts and intensity, downwind of cities, global warming is also causing changes in the precipitation pattern globally, including wetter conditions across eastern North America and drier conditions in the tropics. The globally averaged annual precipitation over land is 715 mm, climate classification systems such as the Köppen climate classification system use average annual rainfall to help differentiate between differing climate regimes. Rainfall is measured using rain gauges, rainfall amounts can be estimated by weather radar. Rain is also known or suspected on other planets, where it may be composed of methane, neon, sulfuric acid, or even iron rather than water. Air contains water vapor, and the amount of water in a mass of dry air. The amount of moisture in air is commonly reported as relative humidity. How much water vapor a parcel of air can contain before it becomes saturated, warmer air can contain more water vapor than cooler air before becoming saturated. Therefore, one way to saturate a parcel of air is to cool it, the dew point is the temperature to which a parcel must be cooled in order to become saturated. There are four mechanisms for cooling the air to its dew point, adiabatic cooling, conductive cooling, radiational cooling. Adiabatic cooling occurs when air rises and 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 surface, usually by being blown from one surface to another. 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
8.
Light
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Light is electromagnetic radiation within a certain portion of the electromagnetic spectrum. The word usually refers to light, which is visible to the human eye and is responsible for the sense of sight. Visible light is defined as having wavelengths in the range of 400–700 nanometres, or 4.00 × 10−7 to 7.00 × 10−7 m. This wavelength means a range of roughly 430–750 terahertz. The main source of light on Earth is the Sun, sunlight provides the energy that green plants use to create sugars mostly in the form of starches, which release energy into the living things that digest them. This process of photosynthesis provides virtually all the used by living things. Historically, another important source of light for humans has been fire, with the development of electric lights and power systems, electric lighting has effectively replaced firelight. Some species of animals generate their own light, a process called bioluminescence, for example, fireflies use light to locate mates, and vampire squids use it to hide themselves from prey. Visible light, as all types of electromagnetic radiation, is experimentally found to always move at this speed in a vacuum. In physics, the term sometimes refers to electromagnetic radiation of any wavelength. In this sense, gamma rays, X-rays, microwaves and radio waves are also light, like all types of light, visible light is emitted and absorbed in tiny packets called photons and exhibits properties of both waves and particles. This property is referred to as the wave–particle duality, the study of light, known as optics, is an important research area in modern physics. Generally, EM radiation, or EMR, is classified by wavelength into radio, microwave, infrared, the behavior of EMR depends on its wavelength. Higher frequencies have shorter wavelengths, and lower frequencies have longer wavelengths, when EMR interacts with single atoms and molecules, its behavior depends on the amount of energy per quantum it carries. There exist animals that are sensitive to various types of infrared, infrared sensing in snakes depends on a kind of natural thermal imaging, in which tiny packets of cellular water are raised in temperature by the infrared radiation. EMR in this range causes molecular vibration and heating effects, which is how these animals detect it, above the range of visible light, ultraviolet light becomes invisible to humans, mostly because it is absorbed by the cornea below 360 nanometers and the internal lens below 400. Furthermore, the rods and cones located in the retina of the eye cannot detect the very short ultraviolet wavelengths and are in fact damaged by ultraviolet. Many animals with eyes that do not require lenses are able to detect ultraviolet, by quantum photon-absorption mechanisms, various sources define visible light as narrowly as 420 to 680 to as broadly as 380 to 800 nm
9.
Soil
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Soil is a mixture of minerals, organic matter, gases, liquids, and countless organisms that together support life on Earth. Soil is called the Skin of the Earth and interfaces with the lithosphere, the hydrosphere, the atmosphere, the term pedolith, used commonly to refer to the soil, literally translates ground stone. Soil consists of a phase of minerals and organic matter, as well as a porous phase that holds gases. Accordingly, soils are often treated as a system of solids, liquids. Soil is a product of the influence of climate, relief, organisms, Soil continually undergoes development by way of numerous physical, chemical and biological processes, which include weathering with associated erosion. Given its complexity and strong internal connectedness soil has been considered as an ecosystem by soil ecologists. Most soils have a dry bulk density between 1.1 and 1.6 g/cm3, while the particle density is much higher. Little of the soil of planet Earth is older than the Pleistocene and none is older than the Cenozoic, Soil science has two basic branches of study, edaphology and pedology. Edaphology is concerned with the influence of soils on living things, pedology is focused on the formation, description, and classification of soils in their natural environment. In engineering terms, soil is referred to as regolith, or loose material that lies above the solid geology. Soil is commonly referred to as earth or dirt, technically, as soil resources serve as a basis for food security, the international community advocates its sustainable and responsible use through different types of soil governance. Soil is a component of the Earths ecosystem. The worlds ecosystems are impacted in far-reaching ways by the carried out in the soil, from ozone depletion and global warming, to rainforest destruction. Following the atmosphere, the soil is the next largest carbon reservoir on Earth, as the planet warms, soils will add carbon dioxide to the atmosphere due to its increased biological activity at higher temperatures. Thus, soil carbon losses likely have a positive feedback response to global warming. Since soil has a range of available niches and habitats. A gram of soil can contain billions of organisms, belonging to thousands of species, mostly microbial, Soil has a mean prokaryotic density of roughly 108 organisms per gram, whereas the ocean has no more than 107 procaryotic organisms per milliliter of seawater. Since plant roots need oxygen, ventilation is an important characteristic of soil and this ventilation can be accomplished via networks of interconnected soil pores, which also absorb and hold rainwater making it readily available for plant uptake
10.
Flowerpot
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A flowerpot, flower pot, or plant pot is a container in which flowers and other plants are cultivated and displayed. Historically, and still to a significant extent today, they are made from terracotta, flowerpots are now often also made from plastic, wood, stone, or sometimes biodegradable material. An example of biodegradable pots are made of heavy brown paper, cardboard. For seedling starting in commercial greenhouses or polytunnels, pots usually take the form of trays with cells and these trays are often called flats. There are often holes in the bottom of pots, to excess water to flow out. The plant can use water with its roots, as needed. Recently, some flowerpots have been made with a watering system. Flowerpots have a number of such as transporting plants to new locations, starting seeds, patio and indoor cultivation of plants. Through the centuries, the use of flowerpots has influenced the use of plants. The Romans brought potted plants inside during cold weather, in the 18th century, pots were used to ship breadfruit seedlings from Tahiti to the West Indies. Also Orchids, African violets and Pelargonium geraniums were shipped in pots from other parts of the world, including Africa, to North America and Europe. In the 18th century, Josiah Wedgwoods flowerpots were as popular as his famous dinner-ware, they were highly decorative. In Athens, earthenware flowerpots were thrown into the sea during the festival of the Gardens of Adonis, theophrastus, c.371 – c.287 BC, mentions that a plant called southern-wood was raised and propagated in pots because it was difficult to grow. The top of the flowerpot underneath the rim is commonly known as the shoulder or collar, flower pots were traditionally made from terracotta. They were made and sold by the cast, which is the number of pots produced from a quantity of clay. The traditional size for a long tom used for auriculas was 3 in diameter by 3.75 to 4 in depth, in the nursery business, plants are generally grown in round or square plastic pots. The sizes of pots have been assigned an ANSI standard by the American Nursery. Pots designated #1–#100 nominally have the volume of that many gallons, but in fact a #1 pot has a capacity of 0.625 gallons
11.
Nitrogen
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Nitrogen is a chemical element with symbol N and atomic number 7. It was first discovered and isolated by Scottish physician Daniel Rutherford in 1772, although Carl Wilhelm Scheele and Henry Cavendish had independently done so at about the same time, Rutherford is generally accorded the credit because his work was published first. Nitrogen is the lightest member of group 15 of the periodic table, the name comes from the Greek πνίγειν to choke, directly referencing nitrogens asphyxiating properties. It is an element in the universe, estimated at about seventh in total abundance in the Milky Way. At standard temperature and pressure, two atoms of the element bind to form dinitrogen, a colourless and odorless diatomic gas with the formula N2, dinitrogen forms about 78% of Earths atmosphere, making it the most abundant uncombined element. Nitrogen occurs in all organisms, primarily in amino acids, in the nucleic acids, the human body contains about 3% nitrogen by mass, the fourth most abundant element in the body after oxygen, carbon, and hydrogen. The nitrogen cycle describes movement of the element from the air, into the biosphere and organic compounds, many industrially important compounds, such as ammonia, nitric acid, organic nitrates, and cyanides, contain nitrogen. The extremely strong bond in elemental nitrogen, the second strongest bond in any diatomic molecule. Synthetically produced ammonia and nitrates are key industrial fertilisers, and fertiliser nitrates are key pollutants in the eutrophication of water systems. Apart from its use in fertilisers and energy-stores, nitrogen is a constituent of organic compounds as diverse as Kevlar used in high-strength fabric, Nitrogen is a constituent of every major pharmacological drug class, including antibiotics. Many notable nitrogen-containing drugs, such as the caffeine and morphine or the synthetic amphetamines. Nitrogen compounds have a long history, ammonium chloride having been known to Herodotus. They were well known by the Middle Ages, alchemists knew nitric acid as aqua fortis, as well as other nitrogen compounds such as ammonium salts and nitrate salts. The mixture of nitric and hydrochloric acids was known as aqua regia, celebrated for its ability to dissolve gold, the discovery of nitrogen is attributed to the Scottish physician Daniel Rutherford in 1772, who called it noxious air. Though he did not recognise it as a different chemical substance, he clearly distinguished it from Joseph Blacks fixed air. The fact that there was a component of air that does not support combustion was clear to Rutherford, Nitrogen was also studied at about the same time by Carl Wilhelm Scheele, Henry Cavendish, and Joseph Priestley, who referred to it as burnt air or phlogisticated air. Nitrogen gas was inert enough that Antoine Lavoisier referred to it as air or azote, from the Greek word άζωτικός. In an atmosphere of nitrogen, animals died and flames were extinguished
12.
Wind
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Wind is the flow of gases on a large scale. On the surface of the Earth, wind consists of the movement of air. Winds are commonly classified by their scale, their speed, the types of forces that cause them, the regions in which they occur. The strongest observed winds on a planet in the Solar System occur on Neptune, Winds have various aspects, an important one being its velocity, another the density of the gas involved, another its energy content or wind energy. In meteorology, winds are referred to according to their strength. Short bursts of high speed wind are termed gusts, strong winds of intermediate duration are termed squalls. Long-duration winds have various names associated with their strength, such as breeze, gale, storm. The two main causes of large-scale atmospheric circulation are the differential heating between the equator and the poles, and the rotation of the planet, within the tropics, thermal low circulations over terrain and high plateaus can drive monsoon circulations. In coastal areas the sea breeze/land breeze cycle can define local winds, in areas that have variable terrain, mountain, Wind powers the voyages of sailing ships across Earths oceans. Hot air balloons use the wind to take trips, and powered flight uses it to increase lift. Areas of wind caused by various weather phenomena can lead to dangerous situations for aircraft. When winds become strong, trees and man-made structures are damaged or destroyed, Winds can shape landforms, via a variety of aeolian processes such as the formation of fertile soils, such as loess, and by erosion. Wind also affects the spread of wildfires, Winds can disperse seeds from various plants, enabling the survival and dispersal of those plant species, as well as flying insect populations. When combined with temperatures, wind has a negative impact on livestock. Wind affects animals food stores, as well as their hunting, Wind is caused by differences in the atmospheric pressure. When a difference in atmospheric pressure exists, air moves from the higher to the pressure area. On a rotating planet, air will also be deflected by the Coriolis effect, globally, the two major driving factors of large-scale wind patterns are the differential heating between the equator and the poles and the rotation of the planet. Outside the tropics and aloft from frictional effects of the surface, near the Earths surface, friction causes the wind to be slower than it would be otherwise
