As a result of the influence of gradient on the speed at which a river flows, it can be observed that ...... . Select one or more: a. on steeper slopes, the river deposits more material than it erodes b. on steeper slopes, the river erodes more material than it deposits c. on flatter ground, the river deposits more material than it erodes d. on flatter ground, the river erodes more material than it deposits e. as a river flows onto its floodplain, its velocity slows and it deposits much of its load