how does the composition of the Earth’s atmosphere affect life on Earth
Protection
Earths atmosphere is a combination of gases
the atmosphere has 7 layers
Breathing
78% nitrogen
21% oxygen
0.9% argon
0.1% other gasses
The earths atmosphere holds in oxygen
Protects from solar flares
Lessens UV Radiation
Lets animals and humans breathe
Bacteria released the oxygen
Almost killed all life as they were 'allergic' to oxygen
the exosphere
the mesosphere
the stratosphere
the troposphere
the thermosphere