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The AtmosphereHill Science 6

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?

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./in2

• 3. The most common gas in the Earth’s atmosphere. What %? Second most common gas?– Nitrogen 78%; oxygen 21%

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?

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

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?

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

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?

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

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• Protects Earth from harmful UV radiation, stratosphere

• Hottest layer as nitrogen and oxygen absorb sun’s energy

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• Protects Earth from harmful UV radiation, stratosphere– Ozone Layer

• Hottest layer as nitrogen and oxygen absorb sun’s energy– thermosphere

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• Meteors burn up here

• Molecules escape into space, satellites orbit here

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• Meteors burn up here– mesosphere

• Molecules escape into space, satellites orbit here– exosphere

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• All weather occurs in this layer, 80-90% of the mass of the atmosphere is here

• Layered gases, thin air, little moisture

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• All weather occurs in this layer, 80-90% of the mass of the atmosphere is here– troposphere

• Layered gases, thin air, little moisture– stratosphere

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• 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.

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• 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

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• Electrically charged particles reflect radio waves and create the Northern and Southern Lights. (Aurora Borealis & Aurora Australis)

• Aurora wikipedia