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Three of the following have response times of a year or less. Which is the odd one out?

  • A.the atmosphere
  • B.the ocean surface mixed layer
  • C.seasonal snow cover
  • D.the Antarctic ice sheet

Answer: D

The ice sheet responds over thousands of years, while the other three all adjust within a season or two. Timescale is what determines which components must be treated as fixed in a given problem. Ice sheets are the slowest of all.

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