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Glossary of Science Explorer, Weather and Climate, Ch.2, Sec5

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Name 5 types of precipitation.

1. rain
2. sleet
3. freezing rain
4. hail
5. snow
What is rain?

Rain is the most common kind of precipitation. Raindrops must be at least 0.5 millimeters in diameter.
How large must drops of rain be?

Drops of water must be atleast 0.5 millimeters in diameter. (Note for scale: 0.5 millimeter = 2/100 inch, do not need to know inches)
What is sleet?

Ice particles smaller than 5 millimeters in diameter. (A form of precipitation.)
What is freezing rain?

Rain that freezes when it touches the ground.
What is hail?

Round pellets of ice larger than 5 millimeters. (A form of precipitation.)

What is snow?

Water vapor (in a cloud) converted directly into ice crystals.
How many sides or branches does every snowflake have?

Every snowflake has six sides.
What is used to measure the amount of rain that falls?

A rain guage
Name the 2 ways snowfall can be measured?

1. A ruler (pushed into the snow on the ground).
2. Melting the collected snow and measuring the depth of water it produces.
What is a drought?

A long period of unusually low precipitation.
What is cloud seeding?

A method of producing rain from clouds by sprinkling dry ice or silver iodide from planes into the clouds.
What is precipitation?

Any form of water that falls from clouds and reaches the Earth's surface.
What must hapen for water droplets or ice crystals to fall to Earth?

They must grow heavy enough to fall through the air.
What 3 factors are needed for precipitation to occur?
There must be:
1. water vapor
2. cold temperatures (dew point must be reached)
3. presence of particals

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