Respuesta :
Because the gravity levels decrese and so does the oxygen levels
The atmospheric pressure lowers as you move up the top of a mountain because the air thins the air you go.
So the weight of the air reduces, and the force the air is able to exert reduces and hence the atmospheric pressure reduces as well.
So the weight of the air reduces, and the force the air is able to exert reduces and hence the atmospheric pressure reduces as well.