User: Classify the following ten cloud types by altitude :
Cirrus, Cumulus, Stratus, Stratocumulus, Cumulonimbus, NimboStratus, Cirrocumulus, Cirrostratus, Altostratus, Altocumulus,
Assistant: These cloud types are generally classified in three different altitude groups.

The lowest hanging clouds are within 2km distance and cover the four types listed here - Stratus, Cumulus, Cumulonimbus, and Stratocumulus.

The middle altitude clouds are within 2 to 7 km distance. The three cloud types in this category are Nimbostratus, Altocumulus, and Altostratus.

Finally, the highest altitude clouds can be as high as 13 kms. These include Cirrus,  Cirrocumulus, Cirrostratus.

Each of these cloud types have further cloud species based on the formation and appearance.