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?

  1. No, valleys do not get deeper.
  2. No, valleys can get deeper, but water cannot make them deeper.
  3. 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.
  4. 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.