Chapter 5

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Chapter 5 Earths Weather
Lesson 2 Air Currents and Wind
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Why are temperatures different?

• Sunlight hits the Earth at different angles.

180
135
90
equator
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Why are temperatures different?

• Direct beams of light (90) create more heat than
  slanted beams.

180
135
90
equator
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Why are temperatures different?

• Places near the equator get more direct sunlight,
  so they are warmer than places
  to the north or south.

180
135
90
equator
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How is air pressure different over land and water?

• sea breeze air moves from high pressure (over
  water) to low pressure (over land).
• land breeze air moves from high pressure (over
  land) to low pressure (over water).

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What are global winds?

• As temperature goes up, air pressure goes down.
• As temperature goes down, air pressure goes up.

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What are global winds?

• Air always moves from areas of high pressure to
  areas of low pressure.

Just think of rolling a ball on a slope it goes
from high to low!
High
Low
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What are global winds?

• convection the rising and falling of gas or
  liquid in a continuous cycle
• When convection happens in air, it forms winds.
• global winds winds that blow in predictable
  directions over long distances

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All images courtesy of Microsoft Office Online.