*BIOLOGÍA*

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Troposphere: More less all water vapour and 80% of the gases are founded here. Meteorological phenomena occur here such as clouds or wind. Temperature here is about -70ºC.

Stratosphere: In the middle of it we can found the ozone layer. This layer is warmer than the troposphere, its temperature is 0ºC.

Ozone layer: This layer is in the middle of the stratosphere and protect us from UV rays, gamma rays or X-rays.

Mesosphere: More altitude = less temperature: in the mesosphere, temperatures can reach -100ºC.

Thermosphere: Temperatures reach 1,500 °C. Solar radiation produces electrically charged ionized gases.

Exosphere: Is the external layer of Earth’s atmosphere. Only are founded molecules of helium and hydrogen. The temperature in the daytime is more than 1000ºC, and -273.15 °C at night.