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Large deep holes at the base of waterfalls are called:

ATarn lakes
BPlunge pools
CPotholes
DSinkholes
Answer & Solution
Correct answer: B. Plunge pools
1. Rotating boulders and water impact dig them. 2. They are plunge pools. 3. Potholes form on rocky hill-stream beds. _Source: syllabus Fundamentals of Physical Geography, Chapter 7, Landforms and their Evolution._
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