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What type of cloud forms at high altitudes and appears wispy and feathery?

Answer 1

Cirrus clouds

This is a broad answer, since Cirrus actually refers to a "family" of clouds which are specifically: Cirrus, Cirrostratus and Cirrocumulus. However, among these three, Cirrus is the one that appears feathery and wispy. This trait has caused these clouds to be named as "mare's tails". Cirrostratus is superficially similar to Cirrus, but Cirrus clouds tend to be more isolated, while Cirrostratus clouds are basically a bunch of Cirrus clouds that covers a wide area in the sky in an almost a blanket/sheetlike manner.

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Answer 2

Mila Bautista

The type of cloud that forms at high altitudes and appears wispy and feathery is called "cirrus clouds."

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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.