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What is the minimum depth needed for a feature to be considered a canyon?
Answer:
In fact, it is a bit like considering when a few grains of sand become a heap of sand: there is no absolute point where something turns from a depression to a canyon.
The definition is simply a deep, narrow steep-sided valley, but the minimum depth is not absolute.
The definition is simply a deep, narrow steep-sided valley, but the minimum depth is not absolute.
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