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The Atmosphere

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Alyssa Collins

on 4 March 2013

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Transcript of The Atmosphere

photo credit Nasa / Goddard Space Flight Center / Reto Stöckli Alyssa Collins
Mr. Lattanzio 1B The Atmosphere Characteristics of the Atmosphere The atmosphere is a mixture of gases that surrounds the Earth.

It holds the oxygen we need to breathe and also protects us from the suns harmful rays.

The atmosphere's composition is always changing.

21% of the atmosphere is oxygen, 78% is nitrogen, and the remaining 1% is made up of argon, carbon dioxide, water vapor, and other gases.

Air pressure is the measure of force with which the air molecules push on a surface. Air pressure changes throughout the atmosphere.

The Earths atmosphere is held around the planet by gravity.

Altitude is the height of an object above the Earths surface. as altitude increases, air pressure decreases. Layers of the Atmosphere -The Troposphere is the lowest layer of the atmosphere it is also the densest layer containing 90% of the atmospheres total mass.
-The stratosphere is the atmospheric layer above the troposphere. In the stratopshere, the air is very thin and contains little moisture.
-The Mesosphere is above the stratosphere, it is the coldest layer of the atmosphere and the temperature drops with increasing altitude.
-The highest atmospheric layer is the Thermosphere, the temperature also increases with altitude.
- The Ionosphere is a part of the thermosphere where gas particles become electrically charged particles.
Heating Of The Atmosphere Radiation is the transfer of energy as electromagnetic waves.

Conduction is the transfer of thermal energy from one material to another by direct contact,

Convection is the transfer of thermal energy by the circulation or movement of a liquid or gas.
The Greenhouse Efftect The Earth's heating process, in which gases in the atmosphere trap thermal energy is known as the greenhouse effect. It is called this because the Earth's atmosphere works a lot like a greenhouse. Atmospheric Pressure and Winds Wind is moving air. It is created by differences in air pressure. When the pressure difference is very great, the wind moves faster.

The Coriolis Effect is the curving of moving objects, such as wind, by the Earths rotation. Because of the Coriolis Effect, the winds in the Northern Hemisphere curve to the right, and those in the Southern Hemisphere curve to the left.
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