THE EARTH'S ATMOSPHERE

The atmosphere is the great layer of air that surrounds the Earth. It has several layers:

1) TROPOSPHERE: it is 15 kilometres high. It is formed by oxygen, nitrogen and other gases.
2) STRATOSPHER: it contains the ozone layer. Ozone absorbs dangerous radiation from the Sun.
3) OUTER LAYERS: there three outer layers:

                                    - Mesosphere
                                    - Termosphere
                                    - Exosphere


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