Q: Name the one metal that melts below room temperature? Choices: - aluminum - gold - bronze - mercury A:
mercury

Q: The combined gradient that affects an ion includes its concentration gradient and its what? Choices: - radiation gradient - cell membrane - electron bond - electrical gradient A:
electrical gradient

Q: Melting ice and grinding wood into sawdust are examples of what? Choices: - chemical changes - reversible changes - unpredictable changes - physical changes A:
physical changes

Q: What is destroying the layer of good ozone? Choices: - greenhouse gas - water pollution - climate change - air pollution A:
air pollution