2. What organization opposed geologist Clair Patterson and his campaign?
(a) American Academy of Pediatrics.
(b) Swimming Pool Safety Institute.
(c) American Dairy Association.
(d) American Petroleum Institute.

3. What components were central to the apparatus that Henry Cavendish used to determine the density of Earth?
(a) Chutes and slides.
(b) Boiling water, a tub, and a barrel.
(c) Weights, counter-weights, and pendulums.
(d) A burner, gases, and switches.

4. Invented in the 1930s, chlorofluorocarbons (CFCs) have proven to be damaging to:
(a) Refrigerator production.
(b) The tourism industry.
(c) Underground caves.
(d) The ozone layer.

5. Which of the following is not a layer of Earth?
(a) Core.
(b) Filling.
(c) Mantle.
(d) Crust.

Short Answer Questions

1. After noticing an unusual phenomenon with uranium salts and a photographic plate, Henri Becquerel asked one of his graduate students to investigate the matter. Who was this student?

2. Halley believed that once scientists figured out the distance from the sun to the Earth, they could then calculate what?

3. The strongest earthquake ever recorded was measured off the coast of Chile in 1960. What did it measure on the Richter scale?

4. Anders Celsius, who designed the Celsius thermometer, was an:

5. When radiation was first discovered, people thought it must have:

(see the answer key)

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