Question

what happens to the atmosphere pressure on mountains

Answer 1

atpmshere pressure on mountains decrease as the altitude increases

Answer 2

$\huge\mathfrak\color{blue}{Answer}$

As altitude rises, air pressure drops. In other words, if the indicated altitude is high, the air pressure is low. This happens for two reasons. ... As altitude increases, the amount of gas molecules in the air decreases—the air becomes less dense than air nearer to sea level.