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Handout 23-3
Name_______________________________________ Period___________
Chapter 23: Section 3: Directed Reading Pages 587-590
Section: Precipitation (page 587)
1. Any form of water that falls to Earth’s surface from the clouds is called ________________________.
2. Name four major types of moisture that fall from the air to Earth.
3. rain
4. drizzle
5. snow
6. sleet
7. glaze ice
8. ice storm
9. hail
a. precipitation consisting of ice particles
b. solid precipitation in the form of lumps of ice
c. a thick layer of ice on a surface
d. clear ice pellets formed when rain falls through a layer of freezing air
e. liquid precipitation
f. rain consisting of drops smaller than 0.5 mm in diameter
g. the condition which produces glaze ice
FORMS OF PRECIPITATION (page 587)
10. What is the size of normal raindrops?
11. What is the most common form of solid precipitation? ________________________
12. In what kind of clouds does hail usually form? ______________________________
13. What process causes hail to form and fall to the ground? _________________________
_____ 14.
What must happen in order for a cloud droplet to fall as precipitation?
a. It must freeze.
b. It must decrease in size.
c. It must increase in size.
d. It must warm up.
_____ 15. What happens in the process of coalescence?
a. Small droplets slow down as they fall.
b. Small droplets combine to form larger droplets.
c. Small droplets break up into smaller droplets. d. Large droplets divide into smaller droplets
_____ 16. During supercooling, a substance becomes extremely cold and
a. changes to a solid. b. changes to a gas.
c. changes to a liquid. d. does not change its state.
_____ 17. What is NOT true of freezing nuclei?
a. They are a form of precipitation.
c. They are solid particles.
b. They are suspended in the air.
d. They are similar to ice in structure.
18. What is the name of an instrument used to measure rainfall?
19. What does Doppler radar measure?
20. Name three things meteorologists can determine with Doppler radar.
WEATHER MODIFICATION
(page 589)
______ 21. The process in which freezing or condensation nuclei are introduced into a cloud to cause
rain is called
a. rain seeding. b. cloud seeding.
c. precipitation growing.
d. nuclei dropping.
______ 22. The substance used in cloud seeding to cool cloud droplets and cause ice crystals to form is
a. powdered dry ice. b. sleet.
c. water vapor.
d. snow.
Chapter 23 Section 3 Review Page 590
1. Identify four forms of precipitation.
2. Compare coalescence and supercooling.
3. Identify the instrument that measures amounts of rainfall.
4. Describe how the amount of snowfall can be measured.
5. Explain how Doppler radar can be used to measure the intensity of
precipitation.
6. Describe how precipitation can be induced or increased artificially.