Which region historically relied most on a large population for manufacturing industries?
A.
Silicon Valley
B.
Frostbelt states
C.
Rustbelt states
D.
Sunbelt states

I believe the answer you're looking for is C. Rustbelt states

Hope this helps!

places of higher salinity. there are parts of the ocean where hardly any rain falls but warm dry winds cause lots of evaporation. this evaporation removes water – when water vapour rises into the atmosphere, it leaves the salt behind, so the salinity of the seawater increases. this causes the seawater to become denser.