Why are deep focus earthquakes much less common than shallow and intermediate focus earthquakes?
A. Rocks at this depth behave in a ductile manner, not in a brittle manner.
B. The primary waves from deep earthquakes cancel out the secondary waves.
C. Past the depth of 350 kilometers in the crust, most rocks are molten.
D. They may be as common, but we don't have the technology to record deep earthquakes.
Answer: A
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