Erosion in which boulders and gravel moving along the channel break apart and as rocks and sediment grind and carve streambeds is known as

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Abrasion is the erosion process in which rocks and sediment grind against each other and the streambed, wearing them away and breaking them apart. This can cause boulders and gravel to break apart and move along the channel, and can also carve and shape the streambed.

Erosion in Which Boulders and Gravel Moving Along the Channel