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The atmosphere (The air around us (Composition of the atmosphere…
The atmosphere
The air around us
Composition of the atmosphere
78%Nitrogen
21% Oxygen
Argon
Carbon dioxide
Bacterias in the earth
Had no oxygen
Make photosynthesis
They make oygen and carbon dioxide
Limestone
Most of carbon dioxide is in limestone
Air
Compress
Expands
Exert pressure
Wind
Is the air in movement