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Author Question: In the United States, what is the term for the softest coal? The hardest coal? What will be an ... (Read 35 times)

james9437

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on: Jul 21, 2018
In the United States, what is the term for the softest coal? The hardest coal?
 
  What will be an ideal response?

Question 2

What is coal? Where did it come from?
 
  What will be an ideal response?


DylanD1323

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Reply #1 on: Jul 21, 2018
Answer to Question 1

Softest is lignite or brown coal. Hardest is anthracite or hard coal

Answer to Question 2

Coal is black or brown rocklike material developed from plants that died 1 million to 400 million years ago.


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