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thames thames

on 29 November 2015

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Transcript of Wind

What is wind?
Wind is air in motion. It is produced by the uneven heating of the earth’s surface by the sun. Since the earth’s surface is made of various land and water formations, it absorbs the sun’s radiation unevenly.
What causes the wind to blow?
As the sun warms the Earth's surface, the atmosphere warms too. Some parts of the Earth are always warm. Other places the climate is colder. Warm air rises. Then cool air replaces the rising warm air. This movement of air is what makes the wind blow.
What is a sea and a land breeze?
Sea breeze:
On a warm summer day along the coast the differential heating of land and sea leads to the local winds called sea breezes.

Land breeze:
A land breeze occurs at night when the land cools faster than the sea.

How is wind helpful to Earth?
Wind is the fastest growing source of electricity in the world. Some experts say it can sometimes be the cheapest form of any kind of power. Generating power from the wind leaves no dangerous waste products behind. Best of all, its supply is unlimited.
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What is the wind turbines?
A wind turbine is a rotating machine which converts the kinetic energy in the wind into mechanical energy. The mechanical energy can be converted into electrical energy. If it used to make electricity, it is called wind turbine.
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