The Earth's gravity.
gravity
Gravity holds the atmosphere around the planet. Gravity is the force that attracts a body toward the center of the planet. For most purposes Newton's laws of gravity apply, with minor modifications to take the general theory of relativity into account.
The planet Mars is slightly smaller than the Earth and therefore has a weaker gravitational field. Gravity is what holds an atmosphere in place. In a weak gravitational field, an atmosphere will gradually leak away into outer space. That's what happened on Mars.
Gravity holds the atmosphere in place. In fact, it perfectly balances the upward pressure gradient force (air pressure decreases as you go up in the atmosphere, causing a gradient that would otherwise generate a VERY strong wind upward). This is called hydrostatic equilibrium.
The Greenhouse Effect.
it holds the cell together a bit like a clamp it holds it in place
the gravitational force holds its atmosphere together
the layer of the atmosphere that holds oxygen is the troposphere and its pause is tropopause
The gravitational force between the Earth and the atmosphere holds the atmosphere close, just like it holds you close to the Earth. (ground)
Gravity holds the atmosphere around the planet. Gravity is the force that attracts a body toward the center of the planet. For most purposes Newton's laws of gravity apply, with minor modifications to take the general theory of relativity into account.
Gravity holds the atmosphere from going into space
Gravity holds it near Earth. Objects with less gravity, such as the Moon or Mercury, have lost most of their atmosphere - or didn't develop an atmosphere in the first place.
Gravity
The Chemical Composition of the Earth's atmosphere is important because it holds the Earth together.
The planet Mars is slightly smaller than the Earth and therefore has a weaker gravitational field. Gravity is what holds an atmosphere in place. In a weak gravitational field, an atmosphere will gradually leak away into outer space. That's what happened on Mars.
What is Gravity?
Gravity.
Gravity.