human
Question: Coal is solid rock that began as organic material that was deposited in a swamp. The formation of coal suggests that

Choices:
A) coal is made mostly of skeletal remains of animals.
B) coal is formed from magma that has solidified over time.
C) it quickly becomes petrified when water is removed.
D) geologic processes continue over millions of years.
gpt
The correct answer is 3: geologic processes continue over millions of years..