Question

Most saltwater-use is to _____.
irrigate crops
provide the public with drinking water
manufacture products like tires and cars
generate electricity

Answer 1

Most saltwater-use is to generate electricity.
There are many ways today to generate electricity, and saltwater is one of those ways. 

Answer 2

Most salt waters are used to manufacture products like tires and cars. This is a big help in the industry. Hope that helps you.