Question

question 2 of 10
during which time period did most of the coal under earth’s surface begin to form?

a. precambrian

b. cenozoic

c. paleozoic

d. mesozoic

Explanation:

Most coal formation occurred during the Paleozoic era, especially the Carboniferous period (part of Paleozoic), due to extensive plant growth and sedimentation that led to coal deposits. The Precambrian had limited complex plant life, Cenozoic is recent (not major coal formation), and Mesozoic focused more on other fossil fuels/geological events.

Answer:

C. Paleozoic