Question

A key industry in the Cascade Mountains region is

aviation.
fishing.
forestry
shipbuilding

Answer 1

I think aviation.

Step-by-step explanation:

because it's not fishing (They don't have a ton of water there), it's not forestry (Not a ton of trees, that I know of), and since they don't have a ton of water, probably not shipbuilding.

Answer 2

I think it’s Fishing