1. Global Winds 6 th Grade Dr. Hooda

2. Air Movement Wind is the horizontal movement of air caused by differences in air pressure. Wind is the horizontal movement of air caused by differences in air pressure. The air moves from High Air Pressure to Low Air Pressure. The air moves from High Air Pressure to Low Air Pressure. The greater the difference, the faster the wind moves The greater the difference, the faster the wind moves

3. Cause of the differences in Air Pressure Caused by the uneven heating of Earth Caused by the uneven heating of Earth Uneven heating produces pressure belts which occur every 30° latitude Uneven heating produces pressure belts which occur every 30° latitude

4. http://www.youtube.com/watch?v=Y e45DGkqUkE

6. Pressure Belts As warm air rises at the equator and moves toward the poles, it cools As warm air rises at the equator and moves toward the poles, it cools As it cools, some of the air sinks around 30° north and south of the equator As it cools, some of the air sinks around 30° north and south of the equator

7. Pressure Belts At the poles, cold air sinks and moves towards the equator At the poles, cold air sinks and moves towards the equator Around 60° north and south, the air begins to heat up and rise Around 60° north and south, the air begins to heat up and rise

8. Global Winds The combination of pressure belts and the Coriolis Effect cause global winds The combination of pressure belts and the Coriolis Effect cause global winds What is the Coriolis Effect? What is the Coriolis Effect? http://www.youtube.com/watch?v=mPsLanVS1Q8&index=9&list=PLEB9AC407A7A1F5BA http://www.youtube.com/watch?v=i2mec3vgeaI These are polar easterlies, prevailing westerlies, trade winds, and doldrums. These are polar easterlies, prevailing westerlies, trade winds, and doldrums.

10. Doldrums ( At the equator 0 ° ) Located along the equator where no winds blow because the warm rising air creates an area of low pressure Located along the equator where no winds blow because the warm rising air creates an area of low pressure

11. Trade Winds (0 ° N – 30 ° N and 0 ° S - 30 ° S) Winds that blow from 30° almost to the equator Winds that blow from 30° almost to the equator Called the trade winds because of their use by early sailors Called the trade winds because of their use by early sailors

12. Horse Latitudes Occur at about 30° north and south of the equator where the winds are very weak Occur at about 30° north and south of the equator where the winds are very weak Most deserts on the Earth are located here because of the dry air Most deserts on the Earth are located here because of the dry air

14. Prevailing Westerlies (30 ° – 60 ° N and 30 ° - 60 ° S) Wind belts found between 30° and 60° latitude Wind belts found between 30° and 60° latitude Flow towards the poles from west to east carrying moist air over the United States Flow towards the poles from west to east carrying moist air over the United States

16. Polar Easterlies (60 ° – 90 ° N and 60 ° - 90 ° S) Wind belts that extend from the poles to 60° latitude Wind belts that extend from the poles to 60° latitude Formed from cold sinking air moving from the poles creating cold temperatures Formed from cold sinking air moving from the poles creating cold temperatures

18. Jet Stream The jet streams are bands of high-speed winds about 10 kilometers above Earth’s surface. The jet streams are bands of high-speed winds about 10 kilometers above Earth’s surface. Separates warm air from cold air Separates warm air from cold air

22. Question 1 What causes winds? What causes winds?

23. Answer Winds are caused by the uneven heating of Earth’s surface, which causes pressure differences Winds are caused by the uneven heating of Earth’s surface, which causes pressure differences

24. Question 2 What are the four types of global winds? What are the four types of global winds?

25. Answer Polar Easterlies Polar Easterlies Westerlies Westerlies Trade Winds Trade Winds Doldrums Doldrums

26. Question 3 What is the difference between a land breeze and a sea breeze? What is the difference between a land breeze and a sea breeze?

27. Answer Sea breezes occur during the day when the land is warmer than water and a land breeze occurs at night when the water is warmer than land Sea breezes occur during the day when the land is warmer than water and a land breeze occurs at night when the water is warmer than land