Tag: the earth's structure

The biosphere is the narrow band of land, water and air where all kinds of life on earth live. This layer ranges from heights of up to ten kilometers above sea level. It is the fourth component of the earth. Biosphere is a life-supporting global ecosystem, where each living things depends on each other and the environment. The biosphere extends over the Earth's surface in a thin layer from a few kilometres into the atmosphere, in very cold environments, to the deep-sea vents of the ocean depths and in very hot and cold environments as well.

According to NASA, the gases in Earth's atmosphere include: Nitrogen — 78 percent. Oxygen — 21 percent. Argon — 0.93 percent.

Nitrogen is important gas of which about 78% of the atmosphere's volume is made up. Nitrogen serves mainly as a diluent. It is relatively inactive chemically, though many f its compounds are very active. Its main function in the atmosphere is to regulate combustion by diluting oxygen. It also indirectly helps in oxidation of different kinds.

Greenhouse gases,

Troposphere is considered as the most important layer of atmosphere. It is the lower most layer of the Atmosphere. Its average height is 13 km. The thickness varies from 8 km to 18 km, with maximum at equator and minimum poles. All the atmospheric phenomena such as rains, wind, clouds, etc. take place in this layer. Troposphere contains roughly 80% of the mass of Earth's atmosphere and it composed of composed of nitrogen (78%) and life giving gas oxygen (21%) with small concentrations of other trace gases. Hence, Troposphere is very important for the existence of life on earth as it causes the cloud formation, raining and maintaining the heat balance of the earth.

Troposphere,