Which term describes small waterfalls or rapids in a river?

Which term describes small waterfalls or rapids in a river?

• A. Small Falls; Small Rapids
• B. Perennial River
• C. Intermittent Stream
• D. Disappearing Stream

Answer: (A)

Small falls and small rapids describe the short drops and rough, fast-moving sections you see in a river where the water is deflected by rocks or a slight vertical drop. These features are about the water’s surface features and how it flows over a short distance, producing foamy, rapid motion. The other terms refer to whether a stream carries water year-round or only seasonally, not to the presence of a drop or rough water; a perennial river flows year-round, an intermittent stream dries up for part of the year, and a disappearing stream ceases flow or goes underground at times. So the best fit for describing minor waterfalls or rapids is small falls and small rapids.