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THE AIR AROUND US (Composition (1% of other gases (Argon (0,9%), And…
THE AIR AROUND US
Composition
21% of oxygen
1% of other gases
Argon (0,9%)
And others
Carbon dioxide (0,038%)
78% of nitrogen
Bacteria changed the atmosphere
Pirmitive atmosphere
No oxygen
First organism capable
To photosynthesis appeared
That cused 2 things
Organic matter was formed
Bacteria used carbon dioxide
Limestone was formed
Bacteria took carbon dioxide and formed oxygen
The properties of air
Air expands
Warm molecules move more rapidly
Air exerts pressure
That produces atmospheric pressure
Air compresses
Molecules can be pushed together
Wind
That is air in movement