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the earths surface.
pressure from the heat under the earths surface
air pressure is the highest near the earths surface
Yes. Atmospheric pressure is the pressure caused by air when it exerts pressure on the surface of earth.
It decreases as you move away from the earth surface
Yes.
it increases
weak and strong,it depends
volcano
mercury
Pressure is the weight of an overlying column of material. The pressure at the core comes from 6400km of overlying rock, which is much denser than air
Mars has a thin atmosphere, mainly of Carbon Dioxide. Its surface pressure is around 0.7 kPa, around 0.7% of Earths surface pressure.