How can a mountain range cause a large desert

Tall mountain ranges prevent moisture-rich clouds from reaching areas of lee, or protected side, of the range. as air rises over the mountain, water is precipitated and the air loses its moisture content. a desert is than formed in the preside “shadow” of the range.

hope this helps :)

First you can subtract 6h-8h =-2h
4-2h=60
-4-2h=-4

2h=56
Now divide and you get 56/2 =28