- The Earth cooled enough for the steam to condense and form the oceans. - The main gas in the atmosphere was carbon dioxide. The mixture of gases is commonly known as air. 2 billion years ago. The thickness of the atmosphere is about 60 miles / 96 kilometers. - Simple plants evolved.
The atmosphere of Earth is composed of roughly 78% nitrogen, 21% oxygen, 0.97% argon and carbon dioxide and about 0.04% other gases and water vapor.
Earth's atmosphere is a layer of gases surrounding the planet Earth and retained by the Earth's gravity.
1 billion years ago. - The first plant produced oxygen, this killed off many other life forms.
The atmosphere of Earth is divided into 6 layers: troposphere, stratosphere, mesosphere, thermosphere, exosphere, and …
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