Answer with Explanation:
I can see that you haven't attached the results.
Under Ideal Gas Law, "pressure" is directly proportional to the number of molecules (provided that the volume and temperature remains constant).
Most of the atmosphere's molecules are drawn towards the surface of the Earth because of "gravity." This means that there are more atmospheric molecules closer to the Earth's surface, which also means the air pressure in lower altitude is higher due to a denser air space.
This, in turn, leaves a lesser number of atmospheric molecules as the height increases which means there is lesser atmospheric pressure in areas of higher altitudes due to a less denser air space.
So, this explains the answer.
