Slide 1: Precipitation
By Tess C.
Slide 2: What is Precipitation?
Precipitation is the general name for water in any form falling from clouds. This includes… Rain Snow Hail Sleet Frost and fog are not considered precipitation.
Slide 3: The Water Cycle
http://en.wikipedia.org/wiki/Water_cycle
Slide 4: What is Rain?
Liquid precipitation in the form of water drops that fall from clouds.
Slide 5: How does it rain?
When raindrop contains as many as 1,000 droplets it is heavy enough for it to fall.
Slide 6: What is Snow?
Snow is precipitation that is composed of ice crystals that fall from clouds. Snow may stick together to form snowflakes.
Slide 7: How does it Snow?
As water cools the molecules move closer together. Since all water crystals are shaped the same they align in a 6 sided crystal.
Slide 8: What is Sleet?
Sleet is raindrops that have frozen into little hard heavy lumps of ice.
Slide 9: How does it Sleet?
Solid precipitation in the form of ice pellets, form when raindrops originated in warmer air aloft freeze as they fall through subfreezing air near the surface of the Earth.
Slide 10: What is Hail?
Hail is precipitation in the form of a chunk of ice that can fall from a cumulonimbus cloud.
http://www.encyclopedia.com/topic/hail.aspx
Slide 11: How does it Hail?
Hail only falls from cumulonimbus clouds. Ice crystals are tossed up and down in the cloud as many as 25 times. Water freezes on the crystals until they are heavy enough to fall as hailstones.
http://www.tornadochaser.ne t/2004/hail.gif
Slide 12: EXPERIMENTS
FUN
Slide 13: Keep Some Snowflakes
What you will need…… Piece of Glass Hair Spray(aerosol) Snow
Slide 14: Keep Some Snowflakes
Directions…… 1 Freeze the piece of Glass and the hairspray before the next snowfall. 2 When you want to collect some snowflakes spray your glass with the chilled hairspray. 3 Go outside and let some snow flakes settle on the glass. 4 When you have enough flakes bring the glass indoors and allow to thaw at room temperature for about 15min. You now have permanent snowflakes!
Slide 15: Sources
www.weatherwizkids.com www.teelfamily.com www.weather.com Weather Facts and Lists By A.Ganeri p.10-13
