Question: Fact 1: Ice wedging is when ice causes rocks to crack by expanding in openings. Fact 2: Water expands as it freezes into ice. Given the two facts above, how does water crack rocks?
OPTIONS:
- Turning to silt
- bottom of feet
- Turning to ice
- Getting hot
- erosion
- Mixing with salt
- lowered energy cost
- Movement
Answer: Turning to ice

Question: Fact 1: Phase changes do not change mass. Fact 2: Melting is a phase change. Given the two facts above, what does not change during melting?
OPTIONS:
- Solid
- Density
- energy
- vapors
- O3
- fats
- Mass
- Sublimation
Answer: Mass

Question: Fact 1: Oil is formed by layers of sediment pushing down on decomposing algae. Fact 2: When the algae dies it is decomposed by bacteria. Given the two facts above, oil is formed by layers of sediment pushing down on what?
OPTIONS:
- bacteria
- nutrients
- amoebae
- tunicates
- oysters
- coral reefs
- mussels
- Bodily water
Answer:
bacteria