The earth is a unique planet of the Solar System because its environment favours the evolution and survival of life to make it a life bearing layer or biosphere.
- It is the only planet supporting plant and human life.
- On the earth moderate temperatures (Mean temp. 15°C) are found. It is neither too hot like Mercury, nor too cold like Jupiter due to optimum distance of the earth from the sun.
- The presence of oxygen nad nitrogen in the atmosphere around the earth favours the existence of life on the Earth. The atmosphere protects the earth from high temperatures.
- The earth is a ‘watery planet’. Water cycle on the earth provides water for growth of all living beings. The earth is the home of man.