Question

which is the third stage/sequence of denudation

Answer 1

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In geology, denudation involves the processes that cause the wearing away of the Earth's surface by moving water, by ice, by wind and by waves, leading to a reduction in elevation and in relief of landforms and of landscapes.

Three regional types of denudation with a different directedness of relief-formation, controlled by the structure of climatic fluctuations, are considered.