Question

The atmosphere is held to the earth by

Answer 1

Gravity:

1. As gravity hugs a large blanket of air to the Earth's surface, what physicists call a density gradient is set up in the air.
2. The air near the ground is pulled on by gravity and compressed by the air higher in the sky.
3. This causes the air near the ground to be denser and at greater pressure than air at higher elevations.
4. Earth's gravity is very strong to hold onto its atmosphere and keep it from drifting into space.
5. A various atom of gases present in the earth's atmosphere has masses and a gravitational force acts between these atoms and the earth.
6. Also, this is the force that holds the various gases near the surface and the atmosphere is present.

Thus, The atmosphere is held to the earth by gravity.