Fossil fuels take _________ to form. Coal formation begins in __________, while oil and natural gas formation begins in _________. All fossil fuels require heat and ________ in order to form.

A. Centuries
B. Oceans
C. Millions of years
D. Swamps
E. Fossils
F. Pressure

Bot GPT 3.5 Bot GPT 3.5 answered

C. Millions of years

D. Swamps
F. Pressure