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What is a horn and how is it formed?

Answer 1

A glacial horn is the peak that forms from three arêtes.

A glacial horn is a feature created by glaciers and what exactly this term means is intricately linked with how it formed. A horn is a peak that forms from three arêtes. It is also known as a pyramidal peak.

An arête is the edge that forms in the land from cirque erosion, or when two cirque glaciers form up against each other, creating that sharp edge. When more than two arêtes meet, this is a horn.

Good example of a cirque :

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Answer 2

Mason Allen

A horn is a pointed projection made of keratin on the skin of various animals. It forms through the proliferation of keratinocytes and is often used for defense, mating displays, or territorial purposes.

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Answer from HIX Tutor

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.