mass movement - where individual particles of soil move slowly down a slope from the force of gravity
slump - where material moves rapidly downslope in one go, for example, in a landslide. In a slump material often rotates as it moves
traction - rolling stones along the bed
suspension - slit and clay-sized particles are carried within the water flow
abrasion - where pebbles rub along the river bank like sand paper
attrition - when pebbles clash together making them rounder and smoother
tributary - where the stream joins the river
velocity - how fast the river flows
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