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4.5 - Rapids, Waterfalls and Gorges

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✅EvaluateQuestion 1 of 21

A waterfall is best described as a place where a river:

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✅EvaluateQuestion 2 of 21

In rapids, a river typically flows:

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✅EvaluateQuestion 3 of 21

The deep hollow at the base of a waterfall created by turbulent erosion is called a:

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✅EvaluateQuestion 4 of 21

A gorge is usually:

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✅EvaluateQuestion 5 of 21

Waterfalls retreat upstream mainly because an overhang becomes unstable and:

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✅EvaluateQuestion 6 of 21

Headward erosion at a waterfall refers to the waterfall moving:

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✅EvaluateQuestion 7 of 21

Which feature is MOST closely linked to rapids rather than a waterfall?

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✅EvaluateQuestion 8 of 21

Which sequence best describes how a gorge forms?

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✅EvaluateQuestion 9 of 21

Which process is MOST responsible for breaking rock by the sheer force of turbulent water at the base of a waterfall?

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✅EvaluateQuestion 10 of 21

A river section in Dominica is loud and foamy, with a steep gradient and boulders, but no single vertical drop. It is MOST likely:

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✅EvaluateQuestion 11 of 21

Dunn’s River Falls (Jamaica) is a tourism site. After heavy rain, the main safety risk near the falls increases because:

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✅EvaluateQuestion 12 of 21

Which statement best distinguishes rapids from waterfalls?

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✅EvaluateQuestion 13 of 21

Kaieteur Falls (Guyana) occurs at the edge of an upland plateau. This setting suggests a waterfall forms where there is a:

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✅EvaluateQuestion 14 of 21

A gorge is most likely to be found:

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✅EvaluateQuestion 15 of 21

A student says: “A gorge forms because deposition builds high banks under a waterfall.” What is the best correction?

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✅EvaluateQuestion 16 of 21

A waterfall retreats at an average rate of 2.5 m per year. Approximately how far will it retreat in 12 years?

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✅EvaluateQuestion 17 of 21

Which set of statements is correct? 1. Waterfalls involve a vertical plunge. 2. Plunge pools form by erosion at the base. 3. Rapids have a single sudden drop. 4. Waterfall retreat produces a gorge.

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✅EvaluateQuestion 18 of 21

A river in St Lucia flows over alternating hard and soft rock. Over time, the soft rock is eroded faster, leaving a step. What feature is MOST likely to develop at the step?

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✅EvaluateQuestion 19 of 21

Kurupukari rapids (Guyana) affect river travel. Which explanation best links rapids to reduced navigation?

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✅EvaluateQuestion 20 of 21

During a storm, discharge in a river rises sharply. Which outcome is MOST likely near a waterfall?

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✅EvaluateQuestion 21 of 21

A field sketch shows a steep rocky slope with many small drops and foaming water, followed downstream by a sudden single vertical drop. What is the BEST interpretation?

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✅EvaluateQuestion 1 of 21

A waterfall is best described as a place where a river:

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