first
Because the air in the mountain is thinner than the bottom.
Pass
A mountain road is a twisty, usually narrow road which is high up in the mountains. A mountain pass is a road which crosses the mountains. Often, a mountain road leads to a pass, but not always.
Yes, Khyber Pass is located in the Hindu Kush mountain range. It is a mountain pass connecting Afghanistan and Pakistan.
Vail Pass
col or gap are used instead of mountain pass as well
A pass in a mountain range is commonly referred to as a mountain pass. It is a route through a mountain range or over a ridge that allows for easier travel between two regions separated by mountains.
the Gothardt Pass in Switzerland
Col (noun) is a three letter word for mountain pass.
The name of the highest mountain pass in the world is Thorong La Pass, located in the Himalayas of Nepal.
Through which mountain range did the Aryans pass to get to the Indian subcontinent?
The word "pass" has multiple meanings. It can mean: To throw to someone else, as in a football pass. To hand something to someone, as in "pass me the peas". As a shortened form of "password" or "passcode", which both mean the same thing in Internet technologies. As a word for an entrance point between landforms, usually between mountain ranges, as in, "The travelers entered the pass below two mountain ranges."