as the altitude increases density of air decreases.This makes it harder to breath.
Air evaporates
Air becomes less dense as you climb the mountain.
As you climb the mountain, the air pressure decreases. The temperature also drops.
As you climb a mountain the air gets colder.
it decreases
less
The atmosphere is full of layers and when you are at ground level, you have a maximum amount of air above you, but when you climb the mountain, the amount of air decreases and thus the pressure Hope that was helpful!
The air is thinner
i think a valley does because when you climb a mountain the air pressure decreases the higher you go.
it decreases
all the air pressure goes down, so as you get higher up, there is less in the air
is decreases