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Unit 3 Lesson 3 Wind in the Atmosphere Blow It Out! 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. Copyright © Houghton Mifflin Harcourt Publishing Company Unit 3 Lesson 3 Wind in the Atmosphere • 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 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 Blowin’ Around 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. 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. Copyright © Houghton Mifflin Harcourt Publishing Company Unit 3 Lesson 3 Wind in the Atmosphere Feelin’ Breezy 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. Copyright © Houghton Mifflin Harcourt Publishing Company