#geography #upsc #csirnet #ugcnet #geology #earth
1. Atmosphere is a mixture of different gases (Air) and it envelopes the earth all round. It contains life-giving gases like oxygen for humans and animals and carbon dioxide for plants.

2. The air is an integral part of the earth’s mass and 99 per cent of the total mass of the atmosphere is confined to the height of 32 km from the earth’s surface. The air is colourless and odourless and can be felt only when it blows as wind.
Evolution of Earth’s atmosphere
• The first atmosphere consisted of gases in the
solar nebula, primarily hydrogen.
Hadean eon (4,540 – 4,000 mya): The primordial
atmosphere
• Volcanic outgassing created the primordial
atmosphere.
• Outgassing from volcanism, supplemented by
gases produced during the late heavy bombardment
of Earth, produced the next atmosphere.
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