Question

which clouds are found at the highest altitudes
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Answer 1

Cirrus clouds are the highest of all clouds and are composed entirely of ice crystals. Cirrus clouds are precipitating clouds, although the ice crystals evaporate high above the earth's surface.

Answer 2

Answer:

$\large\underline\mathtt\blue{Answer - Noctilucent\:}$

Very thin cloud composed of water ice. These clouds are the highest clouds in the atmosphere, located in the mesosphere at an altitude of approximately 280,000ft.

Explanation:

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