What is atmosphere ? How is it contituted
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ATMOSPHERE
The atmosphere is the blanket of gases which surrounds Earth . It is held near the surface of the plently by the Earth's gravitational attraction.
HOW IS IT CONSTITUTED
when Earth formed 4.6 billon years ago from a hot mix of gases and solids , it had most no atmosphere.The surface was molten . As Earth cooled , an atmosphere formed mainly from gases spewed from volcanoes. It included hydrogen sulfide, methane, and ten to 200 years as much as carbon dioxide as today's atmosphere
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