(Question)
Q: What effect in the atmosphere ensures that the earth maintains the correct temperature to support life? Choices: - coriolis effect - ozone effect - smog effect - greenhouse effect A:
(Answer)
greenhouse effect

(Question)
Q: What are large sheets of ice that cover relatively flat ground called? Choices: - land glaciers - cellular glaciers - rocky glaciers - continental glaciers A:
(Answer)
continental glaciers

(Question)
Q: What are the most energetic of all electromagnetic waves, which can be used to treat cancer? Choices: - ultraviolet - infrared - X-ray - gamma rays A:
(Answer)
gamma rays