• Rocks

    Down to a depth of 16 km from the surface of land, 95 per cent of the earth materials found in the earth’s crust consist of rocks.  Rocks are made up of individual substances, called minerals, found mostly in solid state.

    Dec 10, 2010
  • Motions of the Earth

    Earth’s axis is an imaginary line which runs right across and passes through the centre of the earth. The earth spins round its axis which always remains inclined at an angle of 661/2° to the plane of the Earth’s orbit.

    Dec 10, 2010
  • Major Oceans of the World

    Major Oceans of the World

    Dec 10, 2010
  • Major Biomes of the World

    Vegetation comprises of plants growing over the surface of the earth. The plant geographers have divided the vegetation of the world into four great biochores : The Forest Biochore : Defined as plant formation consisting of trees growing close together  nd forming a layer of foliage that shades the ground.

    Dec 10, 2010
  • Latitude and Longitude

    A globe has two fixed points—the North Pole and the South Pole. An imaginary line equator is drawn in such a way that at all points it lies exactly halfway between the two poles. It divides the earth into two equal parts i.e., the Northern Hemisphere and the Southern Hemisphere.

    Dec 10, 2010
  • Landform

    There are three major Landforms : mountains, plateaus and plains. Mountains An uplifted portion of the earth’s surface is called a hill or a mountain. Mountains are classified into the following four types.

    Dec 10, 2010
  • Geological History of Earth

    The earth is believed to have originated about 4600 million years ago.The main geological events in the history of earth can be categorized into the following eras.

    Dec 10, 2010
  • Food Chain

    The sequence of eating and being eaten and the resultant transfer of energy from one level to another is known as the food chain. The plants and algae are the first level in food chain and are known as primary producers.

    Dec 10, 2010
  • Eclipses

    When the light of the sun or the moon is blocked by another body, the sun or moon is said to be in eclipse.

    Dec 10, 2010
  • Earthquakes

    Any sudden disturbance below the earth’s surface may produce vibration or shaking in earth’s crust and some of these vibrations when reaches the surface, are known as earthquakes.

    Dec 10, 2010
  • Continental Drift

    Alfred Wegener was the geologist who in 1924 propagated the theory of continental drift which is very much in vogue now. According to this theory, nearly 150 million years ago,there was a single continent on earth known as ‘pangaea’ which broke into several pieces and began to drift apart.

    Dec 10, 2010
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