Wind

By Aida Reilly

General Information

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Wind is when air moves from an area of high pressure to one of lower pressure.

How is wind caused?

Wind is caused by the differences of air pressure.

Local Winds

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Winds that occur over short amounts of land.

How are local winds caused?

Local winds happen because of unequal heating in Earth's surface within a small area.

Types of local winds include sea breezes and land breezes.

How do sea breezes blow?

Sea breezes blow in the daytime. The sun heats up the land and water, whereas the land heats up more quickly than the water. Air above the land is warm because of this. Heavier, and cooler, air ends up moving closer to the land. The lighter air above the land is now moving upward so the warm air can later take its place. This air that travels from sea to land is a sea breeze.

How do land breezes blow?

Land breezes blow in the evening, closest to night. The land and water are now cooling off, but the land cools of faster than the water. Now we have the heavier and cooler air over the land moving towards the sea. The light air above the sea is rising, allowing the heavier air to move in soon. This process, where air transfers from land to sea is called a land breeze.

Land Breeze (left)................ Sea Breeze (right)

Global Winds

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Winds that occur over large amounts of land.

How are global winds caused?

Global winds occur because of unequal heating within a larger area on Earth's surface. There's also a convection current called the Coriolis effect that allows winds to have a curve.

What is ONE example of a calm global wind?

One calm global wind are the doldrums. They occur right on the equator, 0 degrees latitude.

More types of global winds

There are more global winds. Three of my favorites are the trade winds, prevailing easterlies, and prevailing westerlies. These winds are not calm. The trade winds, named due to their history where people would trade their goods, travel west. They are located around the equator. Then there's the prevailing westerlies. They blow east, which you might not get, hence the name. Last, we have the prevailing easterlies, located at 90 degrees north or south latitude. These winds blow west.

Global Winds... Pictures

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