The Mesosphere part of the atmosphere protects us from the Meteors in space.
The atmosphere keeps oxygen in.(so we can breathe and stay alive.)
The atmosphere is pushing down on us all day every day. Without the atmosphere we would be floating so would everything around us.
Without the atmosphere it would get to hot because of sun radiation.
We would die if there was no atmosphere. Because we would get to hot and we would not be able to breathe.
There is less pressure as you go higher in the atmopshere.
Weather occurs in the troposphere.
The atmosphere protects us from space junk.