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Layers of the Atmosphere
Troposphere
Stratosphere
Mesosphere
Thermosphere
Types of Clouds
Cirrus
Cumulus
Stratus
Storms
Thunderstorms
Tornadoes
Hurricanes
Winter Storms
Cloud Game
Cirrus clouds are light, wispy clouds that form only at high levels (above 6km). They are also made of ice crystals.
From Jon Cooper on Flickr