With the exception of rare stratospheric noctilucent clouds, cirrus forms the highest cloud layer (also cirrostratus or cirrocumulus). In the tropics (where the troposphere is thicker, that is...
Three types of cloud are the highest they are Cirrocumulus, Cirrus cloud and Cirrostratus
Noctilucent Clouds. (Google it)
dust water and air
rain drops
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