Coal-bearing strata in the Appalachian,Illinois and Western Interior coal basins,as shown on the map below,include up to 60 layers of coal,which miners term _____.
A)streaks
B)zones
C)runs
D)formations
E)seams

Question

Coal-bearing strata in the Appalachian,Illinois and Western Interior coal basins,as shown on the map below,include up to 60 layers of coal,which miners term _____. 
A)streaks 
B)zones 
C)runs 
D)formations 
E)seams

Quizplus · Accepted Answer

Coal miners use the term "seams" to refer to individual layers of coal that are found within a coal-bearing rock formation. The Appalachian, Illinois, and Western Interior coal basins all contain numerous seams of coal, with some formations containing up to 60 different layers. Therefore, choice E is the best option.

Coal-Bearing Strata in the Appalachian,Illinois and Western Interior Coal Basins,as