. Fault or fold of a plate depends on its
a. density b. flexibility under force
c. mass d. shape and size
5. Faults can suddenly form during earthquakes
a. false b. maybe
c. possible d. true
6. What are the pieces of the Earth's crust called?
a. Continents b. Plates
c. Puzzle pieces d. Rocks
7. Great earthquakes, on average, occur
a. 500 times annually
b. 100 times annually
c. 20 times annually
d. once every 5 to 10 years
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