Which is a correctly formed compound sentence

sorry but where do we choose from?

sorry, i  know where are the chooses but i  know what is a compound. A compound sentence has two independent clauses or sentences.

An  independent clause is a clause that can stand by itself as a simple sentence or has a complete thought.

"the sandy walls seemed to collapse in on themselves"

and

"the bloodshot waters seemed to have no bottom"

the answer is industry