Coal, Oil, and Natural Gas - AP Environmental Science

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Question

Which type of coal is the cleanest and most efficient?

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Answer

The least efficient and most abundant form of coal is lignite; after this comes bituminous coal, then, lastly, anthracite. Anthracite is a very hard form of coal with an extremely high carbon content. Anthracite also burns the cleanest of any coal, but unfortunately it is the least abundant and hardest to reach form of coal. Charcoal is not coal at all, but rather compressed and burned wood, consisting mainly of carbon and any remaining ash.

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