Question: Q: What is a process that changes some chemical substances into other chemical substances? A:
OPTIONS:
- a bio reaction
- spontaneous mutation
- cellular respiration
- a chemical reaction
Answer: a chemical reaction

Question: Q: What theory brings together continental drift and seafloor spreading? A:
OPTIONS:
- theory of order tectonics
- theory of water tectonics
- theory of front tectonics
- theory of plate tectonics
Answer: theory of plate tectonics

Question: Q: When is the sun directly over the equator? A:
OPTIONS:
- Winter
- Midsummer
- Fall
- equinox
Answer:
equinox