Answer:
cause of tension was that the Soviet Union was trying to spread communism. The U.S. was against communism and they took leadership of containment policy. The Containment policy was the U.S. approach to trying to prevent communism spreading.
Explanation:
They are usually found in caves I believe. If that is incorrect I could try to do some research but I'm pretty sure that's the answer :)
He tried to find alternative uses for them