Item PT023001: Mountains on two different plates would move many miles apart over one million years.

The diagram below shows mountains on two plates that are moving apart. About how much will the distance between mountain A and mountain B change after one million (1,000,000) years? Assume that plates will continue to move at about the same rate as they are moving today.

  1. The distance between them will increase by about forty miles.
  2. The distance between them will increase by about forty inches.
  3. The mountains will move such a small amount that the distance will not be measurable.
  4. Mountains do not move so there will be no change in the distance between them.

Distribution of Responses

Chart showing distrubtion of responses for Item PT023001

Percent of students responding correctly

Overall41%
Grades 6–840%
Grades 9–1241%
Male45%
Female36%
Primary Language is English41%
Primary Language is not English40%

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