Describe the doldrums. Explain air currents and jet streams. Explain how air currents move geographically from time to time during a year. Describe the impacts of air currents on the surface of the Earth. Wind Wind is the result of horizontal differences in air pressure.
Air flows form areas of higher pressure to areas of lower pressure.
Differences in air pressure are caused by uneven heating of the Earth's surface. The land heats and cools more rapidly than does the sea. Water retains heat longer than land, and also takes longer to heat and cool. During the day , the land gets hotter faster, and the hot air rises, creating an area of lower pressure. Wind blows from the sea to the land.