Deep slow-moving water with more sediment is called which feature?

• A. Pool
• B. Runoff
• C. Infiltration
• D. Riparian Zone

Answer: (A)

In streams, deeper, slower sections tend to lose enough energy that suspended sediments settle out, building up finer material and creating a deeper, calmer area known as a pool. This pool forms as water velocity drops and the stream’s energy is dissipated, allowing sediments to accumulate and the water to become deeper than in surrounding riffle sections. The other terms describe different aspects of hydrology or geography: runoff is surface water from rain, infiltration is water seeping into the soil, and the riparian zone is the vegetated area along the stream. So the feature described—deep, slow-moving water with more sediment—is a pool.