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7/30/2019 Earth Science Homework Help - ScholarAnswer
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7/30/2019 Earth Science Homework Help - ScholarAnswer
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Layers of the Earths Atmosphere
Earth Science: Overview
7/30/2019 Earth Science Homework Help - ScholarAnswer
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Composition of Atmosphere
The Atmosphere is the layer of gases that surrounds the planet and makescondition on Earth suitable for living
Nitrogen - 78% ; Oxygen - 21% ; Water Vapor - 0 to 4% ; Carbon Dioxide - .037%
; Other gases make up the rest 99% of atmospheric gases, including water
vapor, extend only 30 kilometer above earth's surface. Most of our weather
occurs within the first 10 to 15 km.
Earth Science: Overview
7/30/2019 Earth Science Homework Help - ScholarAnswer
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The envelope of gas
surrounding the Earth
changes from the ground
up. Five distinct layers have
been identified using-
temperature changes,
chemical composition,movement, and density.
Each of the layers are
bounded by "pauses"
where the greatest
changes in thermal
characteristics, chemical
composition, movement,
and density occur.
Five Layers of Atmosphere
Earth Science: Overview
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Troposphere lowest layer extends up to 10km; contains 99% of the water vapor and 75%
of the atmospheric gases.
This is the first layer above the surface and contains most clouds and half ofthe Earth's atmosphere.
Weather occurs in this layer.
Most of the layers heat is from Earth. Temperature cools about 6.5 degrees Celsius per kilometer of altitude.
Varies in thickness and temperature.
Stratosphere
Approximately 40km thick
Large planes travel through this layer. Because air is thinner at this altitude
and so planes encounter less friction there and can therefore fly faster and use
less fuel.
Earth Science: Overview
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Mesosphere :
It is the third layer of the atmosphere
Extends from the top of the stratosphere to about 85 km above Earth. It is
approximately 40km thick.
There is a wide variety of temperatures because there arent many air
molecules and so they do not absorb a lot of warmth from the sun.
Temperatures decrease with altitude in the mesosphere
It protects Earth from meteoroids that have manages to break through the
Thermosphere.
Earth Science: Overview
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Thermosphere: Thickest atmospheric layer found between 85 km and 500 km
above Earths surface
Suns rays are strong in this zone, and create high temperatures that exceed
1000oC.
The thermosphere is a layer with auroras.
At an altitude of 90 to 300km the IONOSPHERE is found. It is useful from
earths communication system because it contains a lot of electrically charged
particles. These particles bounce radio waves.
Exosphere: The atmosphere merges into space in the extremely thin exosphere.
This is the upper limit of our atmosphere.
Outer layer where space shuttle orbits.
Earth Science: Overview
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Conclusion
Earths atmosphere is divided into five major layers. The
layers are based on temperature.
The troposphere is the lowest layer. Temperature
decreases with altitude in this layer. All weather takes
place here. The stratosphere is the layer above the
troposphere. Temperature increases with altitude in
this layer. The ozone layer occurs here. Themesosphere is the layer above the stratosphere.
Temperature decreases with altitude in this layer.
Meteors burn up here. The thermosphere is the layer
above the mesosphere. Temperature increases with
altitude in this layer. The northern and southern lights
occur here. The exosphere is the highest layer. Air
molecules are very far apart. They may escape Earths
gravity and float into space.
Earth Science: Overview
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