1. Unit 3 Earth’s Atmosphere Big Idea: Earth’s atmosphere is a mixture of gases that interacts with solar energy

2. Up and Away! Copyright © Houghton Mifflin Harcourt Publishing Company What is Earth’s atmosphere? Atmosphere -mixture of gases that surrounds Earth. Functions of the Atmosphere 1.Protecting organisms from sun’s damaging rays 2.Maintain the right temperature range of life 3.Supplies gases necessary for breathing o 78% N o 21% O 2 o 1% other gases Unit 3 Lesson 1 The Atmosphere tecnozono.com

3. Look Way Up Copyright © Houghton Mifflin Harcourt Publishing Company Layers of the atmosphere Thermosphere -temp as altitude Mesosphere –temp as altitude Stratosphere- temp as altitude increases. Ozone absorbs UV Troposphere- temp as altitude temp near the surface vary greatly, contains 80 % of the atmosphere’s total mass Unit 3 Lesson 1 The Atmosphere

4. Here Comes the Sun … Copyright © Houghton Mifflin Harcourt Publishing Company Ozone layer area in the stratosphere that contains a high concentration of ozone. It absorbs most of the sun’s radiation. Greenhouse effect- process by which certain gases in the atmosphere absorb & give off infrared radiation. Unit 3 Lesson 1 The Atmosphere

5. What causes wind? Wind -movement of air caused by differences in air pressure. Coriolis effect - Earth rotates, causing winds to be deflected, or curved. Copyright © Houghton Mifflin Harcourt Publishing Company Unit 3 Lesson 3 Wind in the Atmosphere

6. Copyright © Houghton Mifflin Harcourt Publishing Company Global winds wind systems that occur at or near Earth’s surface. 1.polar easterlies 2.westerlies 3.trade winds Unit 3 Lesson 3 Wind in the Atmosphere

7. 4.Jet streams -narrow belts of high- speed winds that blow from west to east, between 7 km & 16 km above Earth’s surface. Subtropical Polar Copyright © Houghton Mifflin Harcourt Publishing Company Unit 3 Lesson 3 Wind in the Atmosphere

8. Feelin’ Breezy Copyright © Houghton Mifflin Harcourt Publishing Company Local winds -movement of air over short distances. They can blow from any direction. 1.Sea breeze 2.Land breeze 3.Valley breeze 4.Mountain breeze Unit 3 Lesson 3 Wind in the Atmosphere http://bentsci.edublogs.org/2009/11/17/sea-and-land-breezes /