What do you mean by compounds?

A compound is a substance that has two or more chemical elements whose atoms are bonded together. These atoms are chemically bonded in specific ways and in detailed proportions, and the substances cannot be readily separated through simple physical means.

hope this helped :)

A compound is a pure substance consisting of two or more elements which have been chemically combined. Elements have a specific ratio in a compound.

Explanation:

e.g water is a compound made up of hydrogen and oxygen.

lithosphere and asthenosphere

a boiling water reactor does not boil the water. a pressurized water reactor boils the water faster. a pressurized water reactor is heated directly by the core. a pressurized water reactor does not use fission.