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Local Topography: Wind speed and direction at low levels are affected by friction between the air and the ground and by local topography. Friction means the wind speeds near the ground are generally less than at high levels and it also accounts for the generally higher speeds over water as compared with the rougher land surface. Air flow is often channelled in both valleys and urban areas.
There are several ways of expressing the humidity of the air but relative humidity is the most widely used.
Climate is an important factor in determining the location and development of grassland and its composition and production. Most other factors are conditioned by climate, or they result in the modification of the local climatic influence. Topography and elevation are such factors. Climate is not static. Its influence on grassland varies widely from place to place, season to season, day to day, and even within the day and night hours. Adjacent areas may have quite different conditions of microclimate, which in turn influence plant adaptation and thus the grassland species association. Wide differences occur between and within grassland types.
Britain's local government system is also an important focus for the activities of political parties, whose local associations are organized to contest seats on local councils. About 43,000 elected members serve on the 1,450 main local authorities of England and Wales alone. If to them are added the 7,500 parish councils, the number of elected local government members in England and Wales approaches 100,000. |
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