Question

why do different types of coal have different compostions

Answer 1

Hey MATE!

Different types pf coals are found in different regions of the world and no two types are found together.

Also the type of coal formed depends upon the material and its organic composition too.

Hope it helps
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Answer 2

hey friend......

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The harder forms, such as anthracitecoal, can be regarded as metamorphic rock because of later exposure to elevated temperature and pressure.Coal is composed primarily of carbon, along with variable quantities of otherelements, chiefly hydrogen, sulfur, oxygen, and nitrogen.