Kids in the Hall of Planet Earth
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Test Your Knowledge

Test Your Knowledge

1. Since sand is so rough, and in so many pieces, how does it become glass?
A. by exposing it to high heat and then quickly cooling it
B. by freezing it and then slowly letting it thaw
C. by exposing it to high pressure

2. Which would you find at the bottom of the ocean: cold water, hot water, or both?
A. cold
B. hot
C. both cold and hot

3. How can mud be dangerous?
A. mudslides
B. quicksand
C. sinkholes

4. How is sleet different from hail?
A. there is no difference
B. sleet falls mainly during the winter months, while hail occurs during the warmer spring and summer months
C. sleet falls only in the northern hemisphere, while hail falls in both the northern and southern hemispheres

5. How much of the Earth's surface does ice cover?
A. 5%
B. 10%
C. 15%

6. How much of the Earth's fresh water is in the form of ice sheets and glaciers?
A. 50%
B. 68%
C. 75%

7. How could a dead tree stump become hard as rock?
A. if water were to percolate through the wood and replace its cells with minerals
B. if it were buried very deep in the ground
C. if it were exposed to cold temperatures at high altitudes

8. It feels so good to get off an airplane and stand on solid ground, but we know that the ground is not actually still. How does the Earth move beneath our feet?
A. gravitational pull of the moon
B. plate tectonics
C. both A. and B.

9. At what rate do tectonic plates move?
A. about the same rate as your fingernails grow
B. about the same rate as trees grow
C. about the same rate as the Earth orbits the Sun

10. When would a compass not work correctly?
A. at sea
B. in an airplane
C. in places where there is a high level of magnetic force