Sharp grains of dust carried by wind wear away rock and change the features of land. Wind is also a part of weather. A hot, moist day may suddenly turn cool if a wind blows from a cool area to the hot area. Clouds with rain and lightning may form where the cool air meets the hot, moist air. Later, another wind may blow the clouds away and allow the sun to warm the land again.
Wind can carry a storm great distances.
Winds are named according to the direction from which they blow. For example, an east wind blows from east to west. A north wind blows from north to south. The sun heats the surface of the earth unevenly. Air above hot areas expands and rises.