What causes most sediment to wash or fall into a river?
a. friction
b. deposition
c. mass movement and runoff
d. turbulence

The correct answer is letter C. Mass Movement and runoff. The sediments are washed or fall into the river because of the mass movement of the water and the runoff that will surely bring the sediments down.

This is what i found “getting into the technicalities, the continental crust has a density of around 3.0 g/cm3 compared to 2.6 g/cm3 of the continental crust. in addition, the continental crust is much thicker than the oceanic crust. the recycling process does not happen to the continental layer.” i hope this you for what your looking for. can you plz mark me brainliest?