6th grade ch. 2 sec. 5 precipitation
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CH. 2SEC. 5
PRECIPITATION
Objectives:1. What are the common types of precipitation?2. How is precipitation measured?
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precipitation•any form of water that falls from clouds & reaches Earth’s surface
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TRUE OR FALSE
•All clouds produce
precipitation.
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precipitation•cloud droplets or ice crystals must grow heavy enough to fall thru air
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types of precipitation
1. rain
2. sleet
3. freezing rain
4. hail
5. snow
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rain• most common type of precipitation
• @ least 0.5 mm in diameter
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drizzle
• rain < 0.5 mm
• mist-even smaller
• fall from stratus clouds
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• raindrops freeze when touch cold surface (ground)
freezing rain
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sleet•raindrops freeze as falling
•< 0.5 mm in diameter
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Tiny ice pellets aretossed up and down incumulonimbus clouds,growing larger as theygain layers of ice.
Eventually the icepellets grow heavyenough to fall tothe ground as hail.
hail
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hail• ice pellets add layers
of ice as carried up & down in cumulonimbus clouds during thunderstorms
• >5mm in diameter
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snow•water vapor in cloud converts directly ice crystals
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rain measured w/ rain gauge=
–open ended can or tube that collects rainfall
Rain Gauge
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snowfall measured by:
1. using ruler or
2. melting collected snow & measuring depth of water it makes
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drought
• long period of unusually low precipitation
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cloud seeding• small planes used to sprinkle chemicals clouds to try to make rain
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Precipitation Description