Q: Q: The water in some springs are hot because they're heated by what? Choices: - gravity - the sun - fires - hot magma A:
A: hot magma

Q: Q: What material used for helium-filled balloons is dense, strong and opaque, with a high molecular mass that forms films that have many fewer pores than rubber? Choices: - fiberglass - cellophane - foil - mylar A:
A: mylar

Q: Q: What is the structure which hangs from a newly hatched salmon larva? Choices: - air sac - liquid sac - stomach sac - yolk sac A:
A: yolk sac

Q: Q: Evidence for the presence of what on mars makes scientists think that life might have existed there in the past? Choices: - gas - plasma - air - water A:
A: water