CLOUDS
Relative Humidity-the amount of humidity the air contains versus the amount it can actually hold.
cloud types-classicfacation based on:1.shape or form
2.altitude
3.precipatation
Dew point- the temperature the air must cool to in order to be saturated and condensation to occur.
How do clouds form?
warm air rises and cools
the rising air cool and becomes saturated
higher temps. condensation of water vapor on particles such as dust smoke and salt that is suspended in the air as tiny water droplets
stratus=layered 
cirrus-curl of hair
nimbo-rain 
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lower temperatures=below freezing,water vapor turn into a solid,forming ice crystals
cumulus-heaped
.puffy,white clouds that tend to have flat bottoms
formed when warm air rises
indicates fair weather
other adjectives:piled,lumpy,billowy
form in layers
covers large areas of the sky
often blocks the sun or moon
formed by gentle lifting of a large mass of air
fog-stratus cloud that comes in contact with the ground
other adjectives: sheets,blankets
in 1800 luke howard
in 1800 luke howard used latin words to classify the 4 types of clouds.
thin,feathery ,white clouds
high altitudes
formed when the wind is strong
indicated approaching bad weather
other adjectives: wispy looking, horse tails
when nimbo or nimbus is part of the clouds name it means precipitation might fall
nimbostratus-clouds are dark stratus cloud that produce light to heavy continuous rain
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NIMBOSTRATUS CLOUD