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Question
The landforms that are influenced by several processes namely, weathering, erosion, deposition are known as
Options:
A .  Polycyclic landforms
B .  Polygenetic landforms
C .  None
D .  Structural landforms
Answer: Option B
Answer: (b)
The concept of periodic random dominance as an aspect of landform evolution carries with it the implication of polygenetic landforms and landscapes where geomorphic system dominance fails to develop.
Indeed, dominance becomes the special case because it is dependent on a particular juxtaposition of tectonic and/ or climatic elements over a protracted interval in a given area.
One estimate places polygenetic landforms over approximately so per cent of the earth’s land surface. Perhaps 20 per cent is experiencing some type of geomorphic system dominance — less than 10 per cent it Antarctica is omitted from the calculations.

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