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Cirrus	High, thin, wispy clouds made of ice crystals		earth-clouds
Cirrostratus	High, thin sheet that can make a halo around the Sun		earth-clouds
Cirrocumulus	High, small rippled clouds in rows		earth-clouds
Altostratus	Middle-level gray or blue-gray sheet that can cover the sky		earth-clouds
Altocumulus	Middle-level puffy patches in rows		earth-clouds
Stratus	Low gray layer like fog above the ground		earth-clouds
Stratocumulus	Low, lumpy gray and white clouds		earth-clouds
Nimbostratus	Thick, dark layer that brings steady rain or snow		earth-clouds
Cumulus	Fluffy white clouds with flat bottoms		earth-clouds
Cumulonimbus	Tall thunderstorm clouds		earth-clouds
Which cloud makes thunderstorms?	Cumulonimbus		earth-clouds
Which cloud usually means fair weather?	Cumulus		earth-clouds
Which clouds are the highest?	Cirrus family		earth-clouds
Which clouds are low-level?	Stratus, stratocumulus and nimbostratus		earth-clouds
What does cirro- mean?	High, wispy or curly		earth-clouds
What does stratus mean?	Layer or sheet		earth-clouds
What does cumulus mean?	Heap or pile		earth-clouds
What does nimbus mean?	Rain-bearing		earth-clouds
What does alto- mean?	Middle level		earth-clouds
Contrail	A cloud-like trail left behind by a high-flying airplane		earth-clouds
Fog	A cloud that touches the ground		earth-clouds
Mist	A thin fog with tiny water droplets		earth-clouds
Lenticular cloud	A smooth, lens-shaped cloud often near mountains		earth-clouds
Mammatus cloud	Pouch-like bulges on the underside of a cloud		earth-clouds
Noctilucent cloud	Very high thin cloud that glows at twilight		earth-clouds
Anvil cloud	The flat top of a cumulonimbus		earth-clouds
Funnel cloud	A rotating cone of cloud that hasn't touched the ground		earth-clouds
Shelf cloud	Low wedge-shaped cloud at the front of a storm		earth-clouds
Wall cloud	A lowered cloud base under a storm that can produce tornadoes		earth-clouds
How do clouds form?	Rising air cools and water vapor condenses on tiny particles		earth-clouds
What are clouds made of?	Tiny water droplets or ice crystals		earth-clouds
Why do clouds float?	The droplets are so tiny that rising air keeps them up		earth-clouds
Condensation nuclei	Tiny bits of dust or salt that droplets form on		earth-clouds
Cloud cover	How much of the sky is covered by clouds		earth-clouds
Overcast	A sky fully covered by clouds		earth-clouds
Partly cloudy	A sky with some clouds and some blue		earth-clouds
Why are clouds white?	They scatter all colors of sunlight		earth-clouds
Why are storm clouds dark?	They are so thick that little light passes through		earth-clouds
Cumulus humilis	Small, flat fair-weather cumulus		earth-clouds
Cumulus congestus	Tall towering cumulus that can grow into storms		earth-clouds
Mackerel sky	Cirrocumulus or altocumulus that looks like fish scales		earth-clouds
Mares' tails	Long streaks of cirrus clouds		earth-clouds
Halo	A ring of light around the Sun or Moon from ice crystals in thin clouds		earth-clouds
Virga	Rain that evaporates before reaching the ground		earth-clouds
Altitude of high clouds	Above about 6 kilometers		earth-clouds
Altitude of low clouds	Below about 2 kilometers		earth-clouds