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AS and A Level: Atmosphere & Weathering
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Discuss the relative importance of physical and human factors in accounting for changes to vegetation over time within ecosystems in the British Isles5 star(s)
This sere is the climax community in that it is stable and no further succession happens after. The climax community is the deciduous woodland biome we know today. The main characteristics include the location in which they are found, which is in temperate maritime climate such as the UK with four distinct seasons: spring, summer, autumn and winter. The average temperature in the British Isles is 10oC which is the optimum temperature for a temperate deciduous woodland and rainfall is between 30 and 60 inches. Deciduous trees are physically adapted to the climate of the British Isles.
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This creates turbulence, giving rapid and abrupt changes in the wind speed and direction. Usually the greater area of buildings means the wind is slowed down and also changes its direction, due to the friction produced, compared to the rural areas which have even wind speed due to less friction. This is just one of the impacts that urban areas have on wind. However the large urban buildings in the urban areas also cause the wind to eddy when the strong winds hit buildings.
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B)Explain why the amount of solar radiation absorbed by the earth's surface varies from place to place and from time to time.4 star(s)
The sun radiates solar energy which reaches the earth and is converted to heat. The location and time of this reaction, however, is variable due to the shape and tilt of the earth and the fact that it turns. This means that the energy reaches different places at different intensities at different times of day and different times of the year. This is dependent on many factors, not just those to do with the physical state of the earth. The shape, tilt and spin of the earth is the first factor which effects how much energy is absorbed by an area of earth.
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Air sitting over cold water also tends to be cool. Moreover, a great deal of water evaporates from the oceans. This moisture readily condenses in the marine mixed layer (or marine boundary layer) into stratus clouds and fog. Particularly on the western coastlines of continents, the marine air is blown inland by prevailing winds. In addition, the relatively intense heating of the coastal plain generates strong onshore sea breezes, which also draw marine air inland. Sea and land breezes are created by the contrasting temperature between the land and the oceans (or other large bodies of water, such as lakes).
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