How many tons of coal, oil, and gas are estimated to exist in the earth

As of December 31, 2016, estimates of total world proved recoverable reserves of coal were about 1,144 billion short tons (or about 1.14 trillion short tons), and five countries had about 75% of the world's proved coal reserves.

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preservation because he preserves part of the land and preserves means save

explanation:

blue stars have the highest surface temp

stellar distances are usually expressed in light-years

the measure of a star's brightness is called magnitude

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