What is the name given to the areas along a river where the water flows faster and is more turbulent? This usually happens because of a higher river gradient.

Correct option is B

The areas along a river where the water flows faster and is more turbulent due to a steep gradient are called rapids. Rapids are caused by the sudden increase in the slope of the riverbed, resulting in increased velocity and turbulence of the water flow. They are common in youthful rivers or in areas where the river cuts through hard rock.

Information Booster:

1. Rapids are classified based on their intensity, with Grade I being the easiest and Grade VI being extremely dangerous.
2. They are often found in mountain rivers or hilly terrains.
3. Rapids are popular for adventure activities like white-water rafting.
4. The presence of rapids in a river often indicates uneven riverbed topography.
5. Examples of rivers with famous rapids include the Ganges in Rishikesh (India) and the Colorado River (USA).
6. Rapids contribute to erosion and play a role in carving out valleys over time.
7. They are also important ecological zones, providing habitats for various aquatic species.

Additional Knowledge:

• Decays: This term does not apply to river features and refers to degradation or decomposition.
• Shallows: These are parts of a river where the water is shallow but not necessarily turbulent.
• Abyss: Refers to deep, bottomless areas, often associated with oceans, not rivers.