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Wind

Educational presentation about wind for 7th grade science
by

Kelly McGee

on 22 September 2016

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Transcript of Wind

Wind
Wind is the horizontal movement of air from an area of high pressure to an area of lower pressure.
Think back to that lab we did with heat lamps.

Which heated up faster, the sand or the water?
Local Winds
Global Winds
Warm air rises, and cold air pushes it up

The Earth spins so the wind can blow in any direction.
Land Breeze
Sea Breeze
How do we get differences in air pressure?
Unequal heating causes differences in pressure.

Land heats up faster and cools faster.

Water heats up slower also cools slower.
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Winds that are caused by the unequal heating of the Earth's surface within a small area are local winds.
A sea breeze is a local wind that blows from an ocean or lake.
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Would we see sea breezes in the day time or at night time?
Why?
Think About It!
Would we see land breezes in the day time or at night time?
Why?
Think About It!
The flow of air from land to a body of water is called a land breeze.
Global winds occur over a large area. They are global.
Global Convection Currents
The Coriolis Effect
The earth spins!

If the earth did not spin, wind would move in a straight line from the poles to the equator.

But it does spin! So global winds curve.
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Winds are caused by differences in air pressure.
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How do global winds develop?
Warm air rises at the equator.

The air pressure is lower at the equator and higher in other places.

What is created when there are differences in air pressure?
WIND!
Global Wind Belts
The major global wind belts are:
the trade winds
the polar easterlies
the prevailing westerlies
Imagine that you had to trade goods from one continent to another before the invention of trains, planes, and automobiles.

What would you have used?
You would have used a boat with sails!

And before we had engines and motors, you would have had to depend on wind to move your boat.
That is why these winds are called the trade winds. Ships used these winds when they traded.
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Prevailing Westerlies
The prevailing westerlies play an important part in the weather of the United States.
Horse Latitudes
Latitude: distance from the equator, measured in degrees, and goes north and south.
Hundreds of years ago, sailors stuck in these waters ran out of food and water for their horses and had to throw the horses overboard. Because of this, the latitudes 30 degrees north and south of the equator were named the horse latitudes.
Winds near the equator are very weak.
Jet Streams
Bands of high-speed winds called jet streams.
These winds are hundreds of km wide but only a few km deep.

Move west to east at speeds of 200 to 400 kilometers an hour.
Polar Easterlies
The polar easterlies are winds that are intensely freezing and dry, due to its location at such high latitudes. This contributes to the polar climate, which is characterized basically by icy winds of high temperatures.
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