Question

what processes caused coal to form?
a. volcanic explosions
b. glacier formation
c. pressure and heat
d. plate tectonics

Explanation:

Coal forms from plant matter that accumulates in swamps and is subjected to high pressure and heat over millions of years (a process called coalification). Volcanic explosions, glacier formation, and plate tectonics are not the primary processes for coal formation. So the correct option is C.

Answer:

C. Pressure and heat