Earth science 18.3

Earth science 18.3

• 1.
  Cloud Types andPrecipitation 18.3
• 2.
  Cirrus One ofthree basic cloud forms; also one of the three high cloud types; they are thin, delicate ice-crystal often appearing as veil-like patches or thin, wispy fibers.
• 3.
  Cumulus One ofthree basic cloud forms; also the name given to one of the clouds of vertical development; they are billowy individual cloud masses that often have flat bases.
• 4.
  Stratus One ofthree basic cloud forms; they are sheets or layers that cover much or all of the sky.
• 5.
  Bergeron Process Atheory that relates the formation of precipitation to supercooledclouds, freezing nuclei, and the different saturation levels of ice and liquid water.
• 6.
  Supercooled WaterThe conditionof water droplets that remain in the liquid state at temperatures well below O˚C.
• 7.
  Supersaturated Air The condition of air that is more highly concentrated than is normally possible under given temperature and pressure conditions; when describing humidity, it refers to a relative humidity that is greater than 100 percent.
• 8.
  Collision-Coalescence Process A theory of raindrop formation in warm clouds in which large cloud droplets collide and join together to form with smaller droplets to a raindrop; opposite electrical charges may bind the cloud droplets together.
• 9.
  Key ConceptClouds areclassified on the basis of their form and height.
• 10.
  Key ConceptFog isdefined as a cloud with its base at or very near the ground.
• 11.
  Key ConceptFor precipitationto form, cloud droplets must grow in volume by roughly one million times.