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Information about Atmosphere

Published on February 26, 2014

Author: joshiaadi



This presentation gives an idea about our atmosphere.

ATMOSPHERE The atmosphere is a thin layer of air that protects the Earth’s surface from extreme temperatures and harmful sun rays.

COMPOSITION OF ATMOSPHERE Earth’s atmosphere is a thin layer of gases - 78% Nitrogen - 20.99% Oxygen -0.03% Carbon Dioxide - 0.98% Other Gases

LAYERS OF ATMOSPHERE  There are 4 layers of atmosphere. They are1. Troposphere 2. Stratosphere 3. Mesosphere 4. Thermosphere

TROPOSPHERE This is the layer that is closest to the earth surface. It extends up to 11 km above the surface. Contains 99% of water vapor and 75% of atmospheric gases.

STRATOSPHERE It is directly above the Troposphere. Extended from 11 km to 50 km above Earth’s surface. Contains “Ozone Layer” which absorbs harmful ultraviolet rays coming from the Sun.

MESOSPHERE Extends from the top of the Stratosphere up to 85 km above Earth’s surface. This is the coldest atmospheric layer having little ozone. Ionosphere present here.

THERMOSPHERE This is the highest layer of the atmosphere. It’s height ranges from 85-500 km above Earth’s surface. Hottest layer of the atmosphere. Presence of Ionosphere.

UPPER LAYER OF ATMOSPHERE • Exosphere- The atmosphere merges into space in the extremely thin exosphere. This is the upper limit of our atmosphere.

Temperature in atmospheric layers The troposphere is warmed primarily by the Earth’s surface; temperature decreases as altitude increases in this layer. Temperature increases as altitude increases in the stratosphere, particularly in the upper portion – ozone Temperature decreases with altitude in the mesosphere Thermosphere and exosphere are the first to receive Sun’s rays, so they are very hot.

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