What is characteristic of both oil shale and tar sand?
A)They are usable only for aviation fuel.
B)They contain large supplies of heavy oils.
C)They constitute a small but cheap supply of crude oil.
D)They are principal sources of conventional crude oil.

Question

Quizplus · Accepted Answer

Both oil shale and tar sand are characterized by containing large supplies of heavy oils. Oil shale is a sedimentary rock containing kerogen, which can be converted into synthetic crude oil, while tar sand is a mixture of sand, clay, water, and a thick, molasses-like substance called bitumen, which can be upgraded into synthetic crude oil.

What Is Characteristic of Both Oil Shale and Tar Sand