Question

A kind of sedimentary rock formed from plant material over a long period of time is __________.

a. limestone
b. cementation
c. coal
d. compaction

Answer 1

Plants are the basis of a sedimentary rock, known as coal. Over the period of time, carbon is removed from the plants and combined with other organic materials. Generally, organic carbon in coal is 3%, and a major source of natural gas and oil.

Answer 2

From the given item, we are presented with four choices which are types of sedimentary rock. From the choices, we are to choose which among them is formed from a plant material over a long period of time. The answer to this item is letter coal. That is letter C.