Identify the gases in Earthś atmosphere Describe the...
Transcript of Identify the gases in Earthś atmosphere Describe the...
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Earth’s Atmosphere
1-1 IObjectives:
Identify the gases in Earthś atmosphereDescribe the structures of Earthś
atmosphere.Explain what causes air pressure.
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I. Atmosphere
Maintains a balance between the amount of heat absorbed from the Sun and the amount of heat that escapes back into space.
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II. Make up of the Atmosphere
Earth’s Atmosphere extends from Earth’s surface to outer space. It is made up of a mixture of gases with some solids and liquids.
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Other Gases
Water Vapor in the atmosphere varies from 0-4%. The higher the water vapor, the lower the other gases are.
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B. Solids in the Atmosphere
Dust, salt, ice and pollen are four common solids in the atmosphere.Dust-picked up by the windIce-Hail and snowSalt- sea sprayPollen- plants
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III. Layers of the Atmosphere5 layers
Lower atmosphereTroposphereStratosphere
Upper atmosphereMesosphere
Thermosphereexosphere
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ElephantsOn
TattledMonkeys
StupidThe
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a. Lower layers of the Atmosphere
Troposphere ● Where you live
● 99% water vapor● 75% atmospheric
gases● Weather occurs
here
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Stratosphere
● Directly above troposphere
● 10-50 KM● Contains higher
levels of ozone
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B. Upper layers of the Atmosphere
● Mesosphere● Thermosphere
● Exosphere
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Mesosphere● Extends from
the top of the stratosphere to about 85 km above the Earth
● Shooting stars
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Thermosphere
Thickest layerFound between 85 and 500 km above Earth's surface
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WITHIN THE MESOSPHERE AND THERMOSPHERE
Ionosphere● Layer of electrically charged particles● Allows radio waves to travel across the
countryExosphere
● Few molecules● Space shuttle needs bursts from rockets to
move
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Exosphere
● Few molecules● Space shuttle needs bursts from rockets to
move
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IV. Pressure from the Atmosphere
Earth’s gravity pulls the gases from the atmosphere toward Earth creating pressure.
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The higher you go...the less particles there are, which means less pressure.
Air also thins, making it harder to breathe
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Ozone Layer
The ozone layer is an atmospheric layer with a high concentration of ozone gas. It is located in the stratosphere and it helps shield us from the harmful energy of the sun.
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Ozone
Ozone is a natural gas that forms in the stratosphere. It is not normally found in the lower atmosphere and if it is in considered a pollutant.
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OzoneOzone is three oxygen molecules bonded together. (O3)
The oxygen that we breathe is two oxygen molecules. (O2)
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Ultraviolet Radiation
Ultraviolet radiation is one of the types of energy that comes from the sun. Too many UV rays can damage the skin, cause cancer and other health problems for plants and animals.
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A. Chlorofluorocarbons
Chemicals called CFC’s break down the ozone into regular oxygen molecules. These molecules can not absorb the radiation.