1. DO NOW The Atmosphere Hill Science 6

2. The Atmosphere 1. Which layer is the densest layer of the atmosphere containing almost 90% of the atmosphere’s mass? 2. How much pressure is there at sea level? 3. The most common gas in the Earth’s atmosphere. What %? Second most common gas?

3. The Atmosphere 1. Which layer is the densest layer of the atmosphere containing almost 90% of the atmosphere’s mass? – troposphere 2. How much pressure is there at sea level? – 14.7 lbs./in 2 3. The most common gas in the Earth’s atmosphere. What %? Second most common gas? – Nitrogen 78%; oxygen 21%

4. The Atmosphere 4. Auroras are caused by electrically charged particles where? 5. Which layer is composed of layered gases with little moisture, and thin air?

5. The Atmosphere 4. Auroras are caused by electrically charged particles where? – Thermosphere (ionosphere) 5. Which layer is composed of layered gases with little moisture, and thin air? – stratosphere

6. The Atmosphere 6. Which layer of the atmosphere is the coldest layer where temperature decreases and altitude increases? 7. What keeps the gas molecules around the Earth and not floating off into space?

7. The Atmosphere 6. Which layer of the atmosphere is the coldest layer where temperature decreases as altitude increases? – mesosphere 7. What keeps the gas molecules around the Earth and not floating off into space? – gravity

8. The Atmosphere 8. What does pressure do as you rise in altitude through the atmosphere? 9. What are the two highest layers of the atmosphere?

9. The Atmosphere 8. What does pressure do as you rise in altitude through the atmosphere? – decreases 9. What are the two highest layers of the atmosphere? – thermosphere & exosphere

10. DO NOW Protects Earth from harmful UV radiation, stratosphere Hottest layer as nitrogen and oxygen absorb sun’s energy

11. DO NOW Protects Earth from harmful UV radiation, stratosphere – Ozone Layer Hottest layer as nitrogen and oxygen absorb sun’s energy – thermosphere

12. DO NOW Meteors burn up here Molecules escape into space, satellites orbit here

13. DO NOW Meteors burn up here – mesosphere Molecules escape into space, satellites orbit here – exosphere

14. DO NOW All weather occurs in this layer, 80-90% of the mass of the atmosphere is here Layered gases, thin air, little moisture

15. DO NOW All weather occurs in this layer, 80-90% of the mass of the atmosphere is here – troposphere Layered gases, thin air, little moisture – stratosphere

16. DO NOW In which layer of the atmosphere do you live? High speed winds that circle the Earth, airplanes like to travel from west to east in this.

17. DO NOW In which layer of the atmosphere do you live? – troposphere High speed winds that circle the Earth, airplanes like to travel from west to east in this. – jet stream

18. DO NOW Electrically charged particles reflect radio waves and create the Northern and Southern Lights. (Aurora Borealis & Aurora Australis) Aurora wikipedia