Two students designed the experiment shown below to study stream erosion. A steady stream of water flows from a faucet into a tray holding sand and gravel. The water forms a channel by eroding some of the sand and gravel. How can the students increase the amount of sand and gravel being eroded?
A) By increasing the water temperature
B) By adding a bigger load
C) BY increasing the gradient
D) By reducing the amount of discharge
