Question

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How is Earth's surface likely to change when a flowing river slows down over time?

Larger sediments will collect along its edges before smaller ones.
Smaller sediments will collect along its edges before larger ones.
Its channel will become more straight than curved.
Its channel will become more deep than wide.

Answer 1

Answer: Larger sediments will collect along its edges before smaller ones.

Answer 2

Over a long time, the river keeps wearing away at the rock underneath it lowering the bed further and further.  However, there is a limit to how deep a river can carve its bed.  The river cannot cut its bed any lower than the level of the body water it empties into.  So, for example, if the river flows into the ocean, it cannot have a bed that goes lower than sea level.