### cloud:

Cumulonimbus cloud
* Most cumulonimbus clouds associate with intense thunderstorms
  - powerful thunderstorms
  - have tops
* Most cumulonimbus clouds result in clouds
  - wall clouds
* Some cumulonimbus clouds have regions.
* Some cumulonimbus clouds produce heavy rain
* produce precipitation.

### cloud:

Cumulus cloud
* Most cumulus clouds bring weather
  - deliver rain
* Most cumulus clouds indicate fair weather
* are classified as low yet vertically building clouds
  - clouds that have significant vertical development
  - convective clouds
  - detached cauliflower shaped clouds usually spotted in fair weather
  - large clouds that sometimes look like big, fluffy cotton balls
  - lumpy and can stretch high into the sky
  - optically thick
* are puffy clouds that form in warm weather
  - white clouds that usually have a flat base and they can bring bad weather
* are the fluffy, white cotton ball or cauliflower-looking clouds with sharp outlines
  - lovely, puffy ones that are good for finding shapes in
  - usually very isolated with large areas of blue sky in between the clouds
  - very common, especially in warm and moist climates
  - white, puffy clouds that look like pieces of floating cotton
* can continue to build into towering cumulonimbus , or thunderstorms
  - look like animals or people
* change to cumulonimbus clouds.
* come in four distinct species, cumulis humilis, mediocris, congestus, and fractus.
* form via atmospheric convection as air warmed by the surface begins to rise.
* form when air, heated by the sun, rises and cools like bubbles rising in an aquarium
  - strong air currents point upwards
  - thermals carry moisture upwards
* have sharp outlines and a flat base.
* identify regions where moisture is mixed to the cloud condensation level.
* look like cotton balls and cirrus clouds look like strands of angel hair
  - fluffy balls of cotton wool
* make beautiful sunsets.
* owe their existence to the heating of the earth's surface by the sun.
* resemble heaps of cotton or a piece of popcorn, or even cauliflower.
* show development.
* stack like donuts into a flanking line of clouds.

Dark cloud
* Most dark clouds produce precipitation.
* are regions of high dust concentration
  - usually deep and more extensive
* form and rain or hail falls.

Dust cloud
* Most dust clouds are very large.
* absorb blue light, leaving a yellow-red glow.
* are clouds.
* lower global temperature
* reduce visibility to zero.

Funnel cloud
* become tornadoes once they touch the ground.
* can drop out of thunderstorms with little or no warning
  - form over bodies of water, too
* form most frequently in association with supercell thunderstorms.

Gas cloud
* Most gas clouds have motion.
* collide and form new stars.
* form and move around in the protogalaxy on orbits.
* pile up, collide, fragment, and form new stars.

Grey cloud
* Most grey clouds produce precipitation.
* Some grey clouds produce rain.

High cloud
* Some high clouds contain crystal
  - ice crystal
  - have bases
* are the types of clouds that produce a warming effect
  - very cold, so they appear white
* reflect less energy, but trap more of The energy emitted by the surface.
* tend to be darker, where low clouds are lighter colored
  - trap heat and have a warming effect
* warm the Earth's surface.

Higher cloud
* have progressive lower temperatures.
* indicate both dryness of air and higher atmospheric pressure.

Interstellar cloud
* are monitors of the history of element evolution
  - the nurseries of stars and planets
* yield clues to the origins of the element lithium.