Item WE060001: The shape of a valley floor changes when ice breaks rocks as it moves (as in a glacier) and also when water freezes in cracks in the rock of the valley floor.

Which of the following is TRUE about how ice could help to change the shape of a valley floor over many millions of years?

  1. The shape of the valley floor can only be changed by ice when the ice breaks rocks as it moves (as in a glacier).
  2. The shape of the valley floor changes when ice breaks rocks as it moves (as in a glacier) and also when water freezes in cracks in the rock of the valley floor.
  3. Ice can break the rock of the valley floor when it moves as a glacier and when it freezes in cracks, but these processes do not help to change the shape of the valley floor.
  4. Neither the movement of ice (as in a glacier) nor water freezing in cracks are strong enough to break the rock of the valley floor, so these processes cannot help to change the shape of a valley floor.

Distribution of Responses

Chart showing distrubtion of responses for Item WE060001

Percent of students responding correctly

Overall52%
Grades 6–849%
Grades 9–1256%
Male51%
Female53%
Primary Language is English52%
Primary Language is not English48%

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