|
|
|
21. |
What is anthracite? |
A. |
A dark colour sandstone |
B. |
A soft limestone |
C. |
A hard shinny black coal |
D. |
None of these |
Answer: Option C
Explanation:
|
22. |
Which of the following layers of the earth is believed to have the heaviest mineral materials of highest density? |
A. |
Central core |
B. |
Crust |
C. |
Mantle |
D. |
Lithosphere |
Answer: Option A
Explanation:
|
Read more:
|
|