(Q).
Q: Combined substances are either compounds or what? Choices: - solutions - concentrations - combinations - mixtures A:
(A).
mixtures

(Q).
Q: What do power plants burn to generate electricity? Choices: - nuclear fuel - biofuel - timber - fossil fuels A:
(A).
fossil fuels

(Q).
Q: When a meteoroid reaches earth, what is the remaining object called? Choices: - comet - meteor - orbit - meteorite A:
(A).
meteorite