Wind

Wind is the horizontal movement of air over the Earth’s surface from a place of high pressure to a place of low pressure; its cause is the difference in air pressure between places, and that difference comes from land and water heating unequally. By day land heats quickly, pressure is low and wind blows from the sea to the land; at night land cools quickly and the wind blows towards the sea – this wind that changes direction day and night is a breeze. A wind that changes direction twice a year is a monsoon: it blows from sea to land in summer (much rain) and from land to sea in winter (dry); it is strong in East and South Asia. The steady wind blowing from the subtropics (about 30° latitude) to the equator is the trade wind, and the steady wind from the west in the middle latitudes is the westerly; westerlies bring most rain to Uzbekistan. Wind is named after the direction it comes from (a wind from the west is a westerly). The wind vane gives its direction and the anemometer its speed (m/s). Wind is used for sails, mills and wind power stations; it can blow sand and erode soil, so shelterbelts and saxaul are planted. In strong wind keep away from trees and billboards.