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cloud sky nature weather climate atmosphere water vapor condensation ice crystals water droplets reflection refraction scattering absorption dissipation crepuscular rays Tyndall effect halo rainbow corona sun dog mirage cumulus stratus altocumulus altostratus cirrus cirrostratus nimbostratus cumulonimbus mammatus lenticularis pannus pileus mushroom cirrocumulus noctilucent polar stratospheric mesosphere tropical tropopause thermosphere