The Realms of the Earth

The earth is unique as it is the only planet that sustains life. This is made possible because of the presence of Land, Water and Air. We classify each of them into separate realms for better understanding and detailed study.
Structurally, the Earth is divided into layers which are both physically and chemically different. The soil which we stand on is the solid layer with different types of rocks and other minerals. This solid part of the earth is called the lithosphere.
Above this solid earth, there is a blanket of gases/ air covering the earth. This blanket contains various gases in differing proportions and is responsible for many of the climatic phenomenon on earth. This layer is called Atmosphere.
As we all know, 3/4th of the earth’s surface is covered by water in the form of oceans, seas, lakes etc. Apart from that water is present under the soil in the form of ground water and as water vapour and clouds in the atmosphere. The whole of this water content of earth is called Hydrosphere.
Life is possible on earth due to the confluence of water, soil and air. The area of earth where all these factors meet and life is present is called Biosphere or Sphere of Life.

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