Original Project
Weathering, Erosion, and Deposition
The surface of the earth is changed as rock material is broken, carried, and dropped in new locations.
Item WE015003: Water can make a valley deeper by breaking the solid rock layer and carrying loose rocks away from the valley.
In the river valley shown below, there are loose rocks on top of a solid rock layer. Can water make the valley deeper?
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- No, valleys do not get deeper.
- No, valleys can get deeper, but water cannot make them deeper.
- Yes, water can make the valley deeper by breaking off pieces of rock from the solid rock layer of the valley and by carrying loose rocks away from the valley.
- Yes, water can make the valley deeper by carrying loose rocks away from the valley, but water cannot break off pieces of rock from the solid rock layer of the valley.
- Distribution of Responses
- Students Responding Correctly
| Group | Correct | Total | Percent |
|---|---|---|---|
| Overall | 811 | 1372 | 59% |
| Grades | |||
| 6–8 | 496 | 827 | 60% |
| 9–12 | 309 | 535 | 58% |
| Gender | |||
| Male | 388 | 658 | 59% |
| Female | 412 | 697 | 59% |
| Primary Language | |||
| English | 728 | 1219 | 60% |
| Other | 67 | 117 | 57% |