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Earth as a Planet
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Geographic Grid - Latitudes & Longitudes
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Motions of the Earth
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Structure of the Earth
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Landforms of the Earth
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Rocks
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Volcanoes
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Earthquakes
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Weathering and Denudation
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Hydrosphere
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The Atmosphere
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Insolation
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Atmospheric Pressure and Winds
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Humidity and Precipitation
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Types of Pollution
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Sources of Pollution
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Effects of Pollution and Preventive Measures
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Natural Regions of the World
The Atmosphere
Atmospheric Layers and Composition
- The envelope of air that completely surrounds our earth is known as atmosphere. Atmosphere extends to about 1000 km above the earth. 99% of the total mass of atmosphere is found within 32 km.
- The main constituents of air are nitrogen, oxygen, carbon dioxide, argon, helium, ozon
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