How has climate changed over the pl

answer:

the earth's climate has changed throughout history. just in the last 650,000 years there have been seven cycles of glacial advance and retreat, with the abrupt end of the last ice age about 11,700 years ago marking the beginning of the modern climate era — and of human civilization. most of these climate changes are attributed to very small variations in earth’s orbit that change the amount of solar energy our planet receives.

explanation:

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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