OKEASE HELP WILL GIVE BRAINLIEST

a. decomposes use carbon from dead organisms as fuel for cellular respiration, returning carbon dioxide back into the atmosphere.

currents is the correct answer.

it cools slower in the earth meaning the crystals have more time to form than lava on the surface

hydrogen is a compound or a single element and a element is a pure substence that cannot be separated into simpler subtances

clorine is a compound its a chemical substance that forms when two or more different elements combine

so both hydrogen and clorine are compounds