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When the material A mined from the earth...

When the material A mined from the earth is heated strongly in an insufficient supply of air, it produces a solid fuel B which consists mainly of carbon. When another material C obtained from trees is heated in an insufficient supply of air, it produces another solid fuel D which also consists mainly of carbon. Name A, B, C and D.

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The correct Answer is:
A is coal ; B is coke; C is wood; D is charcoal
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