Question

Why is the atmosphere very dense near the surface of the earth?

Answer 1

Variations in air properties extend upward from the surface of the Earth. The sun heats the surface of the Earth, and some of this heat goes into warming the air near the surface. The heated air is then diffused or convected up through the atmosphere. Thus the air temperature is highest near the surface and decreases as altitude increases. The pressure of the air can be related to the weight of the air over a given location. As we increase altitude through the atmosphere, there is some air below us and some air above us. But there is always less air above us than was present at a lower altitude. Therefore, air pressure decreases as we increase altitude. The air density depends on both the temperature and the pressure through the equation of state and also decreases with increasing altitude.
As pressure is lower at higher altitude so density also decrease.... ☺️✌️
[this can also be seen from the formula
PV=nRT
=>P=nRT/V
That is for a unit mass of air
density{rho} = 1/V
From the above formula
P is directy proportional to density{rho}(1/V)]

Answer 2

hey mate here is the ans

atmosphere is a layer of gases that covers the earth
at lower altitude ,that is near the surface of earth, the gravity is more and pressure is more so the layer of gases is compressed and it is dense... this is called the troposphere where all the weather phenomenon occurs
key point *
altitude is inversely proportional to pressure
and pressure is directly proportional to density

hope it helps you