C1c

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  • Created by: Joanna
  • Created on: 01-01-12 00:45

C1c: clean air

The atmosphere today

78% nitrogen

21% oxygen

1% other gases

Air contains different amounts of water vapour

Levels of gas maintained by:

^respiration

^^combustion

^^^photosynthesis

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

Air

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