The hardest coal has the most energy and burns the cleanest. Where do coal miners find the HARDEST coal? A. on the surface of the earth

B. in the oceans

C. deep beneath the earth’s surface

D. at the bottom of shallow lakes and rivers

C

Explanation:

This coal will be more compact and therefore most of the water and CO2 has been expelled due to this. This coal is called Anthracite and burns the cleanest. It is often found in areas with high stress and lots of pressure so mainly far underground. Why do you think the the majority of mines are underground and not open sites? So that they can get to the best coal the most economic and ergonomically way possible

that scientist would be robert hooke