The atmosphere

78%- Nitrogen

21%- Oxygen

0.04%- Carbon dioxide & Methane

• All our weather (short-term features) are found in this layer.
• It is the lowest layer - <12km
• Temperature decreases with altitude
• This is due the crust being the source of heat, the further from it, the lower the temperature 
• The tropopause the outer limit of the troposphere

• 12-50km up
• Temperature increases with altitude
• This is due to the ozone layer being situation in this layer which absorbs UV radiation.
• Winds increase, as pressure falls with height
• Stratopause is the upper limit of this layer

• 50-85km up
• Temperature decreases with altitude
• This is because it is warmed by the stratosphere, the further away, the cooler it is.
• Temperatures are low
• Winds are high
• Mesopause is the upper limit of this layer.

• Uppermost level and so does not have a limit.
• Extends from 85km to about 1000km up.
• Temperature increases with altitude.
• Due to the absorption of UV radiation by oxygen atoms.