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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
Earth as a Planet
Shape and Size of the Earth
- During earlier times it was believed that the shape of the Earth is a flat disc.
- The main believers of this idea were the Greeks, the Babylonians and, the ancient Indians.
- Aryabhatta, the famous Indian astronomer believed that Earth was spherical in shape and rotated
The Conditions that Favour Life on Earth
- Life on the earth exists in a narrow zone called Biosphere. All the necessities for life are fond in this zone. It is the narrow realm of contact and interaction among Atmosphere, Lithosphere and Hydrosphere.
- Energy that brings these three domains together is that of the sun. L
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