Discussion
If P, Q, R, and S refer to Rainfall induced landslide, Bolide impact, Milankovitch cycle, and Supercontinent cycle, respectively, then which one of the following correctly represents the decreasing order of their duration?
Answer: A
The decreasing order of duration is S, R, P, Q.
- Supercontinent cycle (S): about 300 to 500 million years from one assembly to the next.
- Milankovitch cycle (R): orbital cycles of about 23,000, 41,000 and 100,000 years.
- Rainfall induced landslide (P): the failure itself takes seconds to hours, and a slow slide may move for days.
- Bolide impact (Q): the impact and crater excavation last seconds to a few minutes.
Every option begins correctly with S except one, so the question turns on the last three. Option D puts the landslide before the Milankovitch cycle, and option C puts the impact before both, which inverts events lasting minutes against cycles lasting tens of thousands of years.
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