Question

click to correct the homophone if needed.
the sheer enormity of norways troll wall accounts for its popularity among ambitious climbers and base jumpers.
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Explanation:

The word "sheer" is used correctly here to mean "complete" or "utter" when describing the enormity of the Troll Wall. Its homophone "shear" (which means to cut or clip) would not fit contextually. So no correction is needed.

Answer:

No correction needed (the word "sheer" is correct in this context).