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This quiz consists of 5 multiple choice and 5 short answer questions through Part 6, Chapter 29.

Multiple Choice Questions

1. Using a depth sounder during World War II, Harry Hess discovered that ocean floors:
(a) Have canyons and trenches.
(b) Are too deep to be measured.
(c) Have swirling sand drifts.
(d) Are flat.

2. If Earth did not have an atmosphere, it would be what?
(a) Frozen.
(b) Extremely windy.
(c) Dark.
(d) Boiling hot.

3. Humans share 98.4 percent of their DNA with:
(a) Lemurs.
(b) Chimpanzees.
(c) Chinchillas.
(d) Lions.

4. How deep is Earth's atmosphere?
(a) 30 miles.
(b) 120 miles.
(c) 5 miles.
(d) 800 miles.

5. During the Cryogenian period 1.2 billion years ago, Earth was:
(a) Highly volcanic.
(b) Frozen.
(c) Devoid of water.
(d) Without a magnetic field.

Short Answer Questions

1. Plate tectonics refers to:

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

3. Astronomer Edmond Halley believed that the distance from the Earth to the sun could be deduced from the:

4. According to Einstein's theories, what is the nature of space?

5. Continental drift refers to:

(see the answer key)

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