Question

How can water and gravity work together to erode soil,sediment,and rock

Answer 1

Water and gravity work together to erode soil, sediment, and rock with the water loosening the dirt around it, allowing gravity to take action by "pushing" the resources down, letting it roll either slowly or quickly down the slope it may be on.

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Answer 2

ever seen a waterfall ? what do you think happens when all that water slams into the ground below ? same as when you turn a hosepipe on a flowerbed.

also, there's hydraulic cracking where water gets into cracks and freezes, splitting rocks apart.

fast moving water can carry sediment and roll rocks along the bottom. if the water slows down, it drops the rocks and heavier sediment. if it floods a field, say, then drains away, the grass will also filter smaller particles out, or the water might evaporate and leave fine sediment behind.