Pick your answer from: i. heat and cold. ii. heat and fuel. iii. hydrogen and oxygen. iv. heat and pressure. v. pressure and time. vi. scarce resources. vii. kinetic energy. viii. chemical changes.
Q: Fact 1: Heat and pressure change the remains of prehistoric living things into natural gas. Fact 2: Fossils are the remains of prehistoric life. Given the two facts above, what two things turn fossils to natural gas?
A:
iv.