1. Blow It Out! Copyright © Houghton Mifflin Harcourt Publishing Company What is wind? Wind is the movement of air caused by differences in air pressure. Warm air rises, creating areas of low pressure. Cool air sinks, creating areas of high pressure. Air moves from areas of higher pressure toward areas of lower pressure. Unit 3 Lesson 3 Wind in the Atmosphere

2. There are some constant movement of air through earth. This movement is due to the rotation of the earth around the sun. Copyright © Houghton Mifflin Harcourt Publishing Company Unit 3 Lesson 3 Wind in the Atmosphere

3. How does Earth’s rotation affect wind? Earth rotates, causing winds to be deflected, or curved. The apparent curving of the path of a moving object from an otherwise straight path due to Earth’s rotation is called the Coriolis effect. Copyright © Houghton Mifflin Harcourt Publishing Company Unit 3 Lesson 3 Wind in the Atmosphere

4. Blowin’ Around Copyright © Houghton Mifflin Harcourt Publishing Company What are examples of global winds? Global winds are wind systems that occur at or near Earth’s surface for a long distance covering a large area of earth. Unit 3 Lesson 3 Wind in the Atmosphere What are examples of global winds? Jet streams are narrow belts of high-speed winds that blow from west to east, between 7 km and 16 km above Earth’s surface.

5. Feelin’ Breezy Copyright © Houghton Mifflin Harcourt Publishing Company What are examples of local winds? Local winds are the movement of air over short distances. They can blow from any direction. The wind is known by the direction from where it is coming from. Unit 3 Lesson 3 Wind in the Atmosphere