C1c: clean air
The atmosphere today
1% other gases
Air contains different amounts of water vapour
Levels of gas maintained by:
ALL LIVING THINGS RESPIRE! i.e take in oxygen and give out Carbon dioxide.
RESPIRATION AND COMBUSTION DECREASE OXYGEN LEVELS AND INCREASE CARBON DIOXIDE LEVELS.
PHOTOSYNTHESIS INCREASES OXYGEN LEVELS AND DECREASES CARBON DIOXIDE LEVELS.
PHOTOSYNTHESIS AND RESPIRATION BALANCE OUT!!!!!
The early earth
Earliest atmosphere contained ammonia and carbon dioxide (came from inside earth) - released from volcanoes
Photosynthesis decreased the amount of CO2 and increased the amount of oxygen