Answer :

Extreme level and very high level (polar stratosphere) are how they are classified by altitude (polar mesospheric).

Although the tops of very massive cumulonimbi form clouds can penetrate the lower stratosphere, three of the five physical types that are present in the troposphere—stratiform, cirriform, and stratocumuli form—are also present at these higher levels.

Clouds in the stratosphere and mesosphere above the troposphere are categorized separately, with common names for the main categories and alpha-numeric nomenclature for the subtypes.

The list of cloud types divides all genera into four categories: high (cirri, cirrus), medium (alto), multi-level (nimbo, cumulo, cumulus), and low (nimbo, cumulo, cumulus) (strato-, stratus). The altitude level or levels in the troposphere at which each of the many cloud forms is typically found determines these classifications.

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