Why is there a greater variety of compounds than of elements and atoms?

Why is it incorrect to balance a chemical equation by changing the subscripts? explain.

What percentage of energy used in the u.s is produced from fossil fuels

Astream of surface water reaches a porous portion of sediment and seeps into the ground. this water eventually joins a large reservoir of water located beneath the earth's surface. the example above describes the interacting with the a. cryosphere; biosphere b. hydrosphere; biosphere c. hydrosphere; geosphere d. cryosphere; geosphere