The top documents tagged [coal minesall]

Ingrid Sullivan, Alex Gotsky, Michael Bradac. How it’s Made Coal is formed from the remains of vegetation that grew as long as 400 million years ago.

Ingrid Sullivan, Alex Gotsky, Michael Bradac. How it’s Made Coal is formed from the remains of vegetation that grew as long as 400 million years ago.

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COAL

COAL

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