Evolution of Atmosphere

EVOLUTION OF ATMOSPHERE

Earth’s initial atmosphere was composed of hydrogen and helium, the passage of time got replaced by Nitrogen and Oxygen due to the impact of solar winds. This process gets completed through three stages.

STAGE 1- MODIFICATION OF ATMOSPHERE THROUGH SOLAR WINDS

The first stage of the formation of the Atmosphere is known as the loss of primitive atmosphere. Initially, the earth’s atmosphere is composed of hydrogen and helium. All the terrestrial planets including earth lost their primordial atmosphere due to solar winds.

NOTE- The solar winds refer to the stream of charged particles coming from the outer atmosphere of the sun and traveling in the entire solar system.

STAGE 2- MODIFICATION OF ATMOSPHERE THROUGH EARTH’S INTERIOR

In the second stage, the heat coming from the interior of the earth change and evolve the atmosphere. When the earth started cooling various gases and water vapor was released from the earth’s core. At this time atmosphere consists of water vapor, nitrogen, methane, carbon dioxide, ammonia, and very little oxygen. These gases and water vapor are coming out with the help of volcanic eruptions.

NOTE- Degassing is the process through which the gases were outpoured from the interior of the earth.

STAGE 3- MODIFICATION OF ATMOSPHERE THROUGH PHOTOSYNTHESIS

Further chances occurred in the atmosphere due to the living organism through photosynthesis. Living organisms were dominate only oceans for a long period. It helps in flooding the

atmosphere with oxygen. Thus, nitrogen and oxygen dominate the earth’s atmosphere.