Wind in the Atmosphere Unit 8 Lesson 1 Complete each box. What causes Wind? _____________ cells 1. The uneven heating of Earth’s surface by the ________ causes temperature differences in the air. Low Pressure is found: 1. 2. Warm air ________, creating areas of ________ pressure. Cool air _______, creating areas of ____________ pressure. 2. 3. Air moves from areas of higher pressure toward areas of ___________ pressure. High Pressure is found at In the diagram below, label the air masses and types of pressure Cool Warm _________ ________ Air sinks Air Rises _______ Pressure 8. How does the sun contribute to global wind patterns? _______ Pressure 9. Earth rotates, causing winds to be _____________________, or curved. 10. The apparent curving of the path of a moving object from an otherwise straight path due to Earth’s rotation is called the __________________ effect. ______________________________ Process 4. Wind is the movement of air caused by differences in __________ pressure. 5. Cold air at the _____________ creates areas of high pressure there. Warm air at the __________________ creates an area of lower pressure. 11. Points on Earth closer to the _______________ must travel faster than points close to the poles to make one complete rotation each day. 6. Globally, air moves in circular patterns called ______________ cells. 12. In the Northern Hemisphere, air moving to the north curves to the 7. Convection cells occur at about every 30o of latitude, producing _______________________ belts ___________, and air moving to the south curves to the west. What are examples of global winds? 13. ___________________ winds are wind systems that occur at or near Earth’s surface. The _________ _______________- blow between poles & 60o latitudes & curve west The _________________ - between 30o & 60o & curve east ____________ winds- Between 30o & 0o What are examples of local winds? Label High and Low Pressure on each picture 20. _______________ winds are the movement of air over short distances. They can blow from any direction. 21. A ____________ breeze forms during the day, as cooler air over the ocean flows toward the land. ____________ winds- Curve to the west The _________________ - blow from west & curve east 22. A ____________ breeze forms at night, as cooler air from the land blows toward the water. The _________ _______________- blow from east & curve west 14. The trade winds of both hemispheres meet in a calm area around the equator called the ______________. Very little wind blows in the doldrums. 15. The _____________ latitudes are calm areas at about 30° latitude in both hemispheres. Air stops moving and sinks in the horse latitudes. 16. Winds are named for the direction they flow _________________ 17. _____________ streams are narrow belts of high-speed winds that blow from west to east, between 7 km and 16 km above Earth’s surface. 23. During the day, the sun warms the air on mountain slopes faster than it warms the air in a valley. This results in areas of _________ pressure near the mountain tops. 24. The pressure difference causes a _________________ breeze, which flows from the valley up the slopes of mountains during the day. 18. Jet streams follow boundaries between________ & cold air and can shift north & _____________. 19. The two main jet streams are the ________________________ jet stream and the _______________ jet stream. 25. At night, as air along the mountain slopes cools, it flows down into the valley, creating a _________________ breeze.