Because - the further away from the Earth's surface you go - the less gravity there is to hold the air molecules in place.
yes
You cannot make that generalisation. Barometric pressure depends on altitude and on the current weather conditions.
because air pressure decreases as altitude increases. As air rises, the pressure decreases. It is the lower pressure at higher altitude that causes temperature to be colder on the top of a mountain compared to sea level.
no
From west to east
The Andes Mountains are near the Pacific Ocean in South America.
Because there is more air (which has weight) above you if you are around sea level. If you fly up, or climb a mountain, there is less air above you, therefore less air pressure.
The Sierra Nevada mountain range is located near the Pacific Ocean in the western United States. It stretches from north to south through California and Nevada.
Andes Mountains
Mount Bitterroot
yes
Tropical low pressure belt
Trenches
Near the earth's surface.
trenches
It was mount bitter root!
trenches