Question: Fact 1: Sand dunes are formed by the wind transporting and depositing sand. Fact 2: Vegetation stabilizes the sand, preventing the wind from forming dunes. Given the two facts above, what will prevent the formation of sand dunes?
OPTIONS:
- focusing a lens
- forces
- energy barrier
- flooding
- erosion
- less water
- Solar energy
- vegetation
Answer: vegetation

Question: Fact 1: Mammals generate heat mainly by keeping their metabolic rate high. Fact 2: Faster metabolism means more calories consumed, and usually, weight loss. Given the two facts above, how do mammals generate heat?
OPTIONS:
- freezing
- Ice cubes
- layers of fat
- Taking pictures
- with their fur
- energy of moving objects
- Consuming calories
- Movement of an air mass
Answer: Consuming calories

Question: Fact 1: Afirecracker converts chemical energy into sound. Fact 2: Sound waves vibrate. Given the two facts above, a firecracker converts chemical energy into what?
OPTIONS:
- kinetic energy
- Loud noises
- vibrating waves
- An object is seen
- electromagnetic energy
- deoxyribonucleic acid
- hydrogen and oxygen
- harmful substances
Answer:
vibrating waves