Over hundreds of millions of years,high pressure and temperature transformed ____ into deposits of oil and natural gas.
A) coal
B) land animal remains
C) land plant remains
D) plankton remains
E) sedimentary rock

Question

Over hundreds of millions of years,high pressure and temperature transformed ____ into deposits of oil and natural gas.  
A) coal
B) land animal remains
C) land plant remains
D) plankton remains
E) sedimentary rock

Quizplus · Accepted Answer

Plankton remains, specifically those of microscopic algae called diatoms, were transformed into oil and natural gas through the process of heat and pressure over millions of years.

Over Hundreds of Millions of Years,high Pressure and Temperature Transformed