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LMS Ch 23.3 DR

Precipitation Directed Reading

QuestionAnswer
The diameter of most cloud droplets is about?? 20 micrometers.
What must happen in order for a cloud droplet to fall as precipitation?? It must increase in size.
What two processes cause cloud droplets to fall to Earth?? Coalescence and Supercooling.
What happens in the process of coalescence?? Small droplets combine to form larger droplets.
During supercooling, a substance becomes extremely cold and?? Does not change its state.
What is NOT true of freezing nuclei?? They are a form of precipitation.
Why don’t supercooled water droplets freeze?? There are not enough freezing nuclei available.
Which of the following are created by the process of supercooling?? Snow and Rain.
The process in which freezing or condensation nuclei are introduced into a cloud to cause rain is called?? Cloud Seeding.
Which of the following are introduced into a cloud to cause rain because they resemble ice crystals?? Silver Iodide Crystals.
The substance used in cloud seeding to cool cloud droplets and cause ice crystals to form is?? Powdered Dry Ice.
Rain?? Liquid precipitation.
Drizzle?? Rain consisting of drops smaller than 0.5 mm in diameter.
Snow?? Precipitation consisting of ice particles.
Sleet?? Clear ice pellets formed when rain falls through a layer of freezing air.
Glaze Ice?? A thick layer of ice on a surface.
Ice Storm?? The condition which produces glaze ice.
Hail?? Solid Precipitation in the form of lumps of ice.
Created by: ericyonggyuhong
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