A foliated, greasy metamorphic rock composed of graphite is classified as a(n)
A) lignite.
B) anthracite.
C) subbituminous coal.
D) bituminous coal.

Question

Quizplus · Accepted Answer

A foliated, greasy metamorphic rock composed of graphite is classified as anthracite, which is a type of coal that contains a high percentage of carbon and is the highest rank of coal. Lignite, subbituminous coal, and bituminous coal are also types of coal, but they do not contain graphite and are not typically classified as metamorphic rocks.

A Foliated, Greasy Metamorphic Rock Composed of Graphite Is Classified