Describe a process by which a stream can erode its streambed

Under which condition below would u expect a coarse-grained intrusive rock like diorite to form?

Acanyon on the ocean floor at which the crust bends downward is called a(n)

Iii-eneral sciencewhich of these is the best explanation of how a smooth round stone became smooth? a continuous freezing and thawingbvolcanic actioncit fell off the side of a cliffdit was in a stream for a long time.