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This quiz consists of 5 multiple choice and 5 short answer questions through Part 5, Chapter 25.

Multiple Choice Questions

1. When did the last supervolcano erupt on Earth?
(a) 9,000 years ago.
(b) 23,000 years ago.
(c) 1,100 years ago.
(d) 74,000 years ago.

2. During the time of the dinosaurs, Earth's magnetic field was:
(a) Three times stronger than today.
(b) Three times weaker than today.
(c) Fluctuating wildly.
(d) Same as it is now.

3. Earth is the only planet in the solar system to have what?
(a) Mountains and valleys.
(b) Moons.
(c) Storms.
(d) Plate tectonics.

4. In the 1700s, people were finding holes in theories. For example, if the thoughts on erosion were completely correct, then:
(a) All farmland would have been washed away.
(b) There would be no mountains, only smooth hills.
(c) Sand would be ground to fine powder.
(d) Icebergs would have eroded long ago.

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

Short Answer Questions

1. The troposphere is the layer of atmosphere:

2. Compared to at sea level, oxygen at a few thousand feet above sea level is:

3. 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?

4. How quickly can bacteria create a new generation?

5. Harry Hess determined that, in the Atlantic, the ocean floor is:

(see the answer key)

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