The answer to your question is it removes the most fertile part of soil
The different blood vessels; First, Arteries that carry the blood from the heart. Then, the Capillaries which allow an exchange of water and chemicals throughout the blood and the tissues. Finally, Veins that carry blood from the capillaries to the heart.
Not completely sure, but maybe C.?
I'm pretty sure it's deposition because the sediments in the water(soil) are building up on the rock.