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Chemistry - The Earth's Atmosphere

The Earth’s atmosphere is composed of four main layers; the Troposphere, Stratosphere, Mesosphere and the Ionosphere. Each of these atmospheric layers has its own special properties. Gravity holds the atmosphere close to Earth, and the four layers are divided according to differences in temperature.

The mixture of gases in the Earth’s atmosphere has taken about 4.5 billion years to evolve. Around 99% of the atmosphere is made up of two gases: nitrogen and oxygen. The remainder is made up of very small amounts of:

Argon

Carbon dioxide

Hydrogen

Ozone

Methane

Carbon monoxide

Helium

Neon

Krypton

Xenon

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