The following three major spheres are found on earth:
1. Lithosphere,
2. Atmosphere,
3. Hydrosphere.
1. Lithosphere : Lithosphere is the upper most layer of the earth in which mankind lives. Soils and various types of minerals found in the lithosphere are significant for sustenance of life of living organisms present on earth.
2. Atmosphere : The gaseous cover which surrounds the earth is known as atmosphere. This retains around the earth due to the gravitational force of the earth. Gases have played a significant role in the composition of the atmosphere. Nitrogen and oxygen are the major gases present in the atmosphere. Apart from these, water vapour and dust particles are also present in it.
3. Hydrosphere : It is spread upon around 71 per cent part of the earth’s surface. Water is found on earth in various oceans, seas, lakes and rivers.
Due to the interaction of all these three spheres, a fourth sphere named biosphere is formed. Living beings, flora and fauna and human beings exist reside in the biosphere itself.