1. Through which process do fossil fuels form?
A. Wind and water gradually break rock into pieces.
B. Volcanic lava cools and hardens after an eruption.
C. Heat and pressure act on layers of sediment over time.
D. Acids in rainwater slowly convert rock to other substances.

2. A magnet attracts a piece of metal. How is this event like a chemical bond?
A. A chemical bond is an interaction that always involves a metal.
B. A chemical bond is an interaction that holds two atoms together.
C. In a chemical bond, the substances that come together do not change. D. In a chemical bond, the substances that come together can be physically pulled apar