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

2. When radiation was first discovered, it was sometimes added to:
(a) Stews and casseroles.
(b) Drinking water.
(c) Toothpastes and laxatives.
(d) Gasoline and alcohol.

3. Today, scientists know that radiation in high doses is:
(a) Healthy.
(b) Toxic.
(c) Tolerable.
(d) Safe.

4. Halley believed that once scientists figured out the distance from the sun to the Earth, they could then calculate what?
(a) Weight of Earth.
(b) Distances to other planets.
(c) Weight of the sun.
(d) Distances to distant stars.

5. When French physicist Henri Becquerel accidentally left a packet of uranium salts on a photographic plate, what happened?
(a) The salt crystals melted into the plate.
(b) The plate became magnetic.
(c) The plate rusted.
(d) An emission from the salts ruined the plate.

Short Answer Questions

1. In 1971, Mike Voorhies discovered an amazing fossil bed in Nebraska full of skeletons of prehistoric animals killed 12 millions years ago. How did they die?

2. Invented in the 1930s, chlorofluorocarbons (CFCs) have proven to be damaging to:

3. While he worked at General Motors Research Corporation in 1921, engineer Thomas Midgley, Jr. developed what dangerous gasoline additive?

4. What is found at the very center of the Earth?

5. During the time of the dinosaurs, Earth's magnetic field was:

(see the answer key)

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