Crude oil was formed million of years ago from the remains of living things. where is crude oil found today?
A. inside living things that have died
B. inside rocks
C. under dry land and under the ocean
D. floating in the ocean
C. under dry land and under the ocean
Which fuel creates the most air pollution when burned
A. natural gas
B. clean fuels
C. coal
D. electeity
C. coal
When were fossil fuels formed?
A. hundreds of years ago
B. Tens of billions of years ago
C. millions of years ago
D. tens of years ago