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Early atmosphere

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Across
3.Scientists think the Earth was formed four and a half ....... years ago
7.The water vapour cooled and condensed to form these
8.This gas was thought to be the main constituent of Earth's early atmosphere (2 Words)
9.CH4 - a gas that was thought to have been present in the early atmosphere
10.Toxic gas composed of nitrogen and hydrogen
Down
1.Process where plants make food and oxygen using sunlight, water and CO2
2.Simple organism that evolved between plants and bacteria
4.Animals need oxygen for this process
5.Primitive live form that first appeared on the planet
6.These released the gases that formed the early atmosphere

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