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Name _______________________________Class ____ Date ________ p. 162 Weather Ch. 2 Sect. 1 p. 38-44 Directed Reading Water in the Air p. 38 Write the letter of the best answer for each question on the line. _____ 1. What do we call the condition of the atmosphere at a certain time and place? a. the water cycle c. climate b. weather d. precipitation THE WATER CYCLE P. 38 _____ 2. How does water go from Earth into the air? a. precipitation c. evaporation b. condensation d. runoff _____ 3. In what part of the water cycle do clouds form? a. precipitation c. condensation b. evaporation d. runoff _____ 4. Rain, snow, sleet, and hail are forms of what? a. condensation c. precipitation b. evaporation d. runoff Humidity p. 39 Read the words in the box. Read the sentences. Fill in each blank with the word or phrase that best completes the sentence. humidity water vapor 5.Moisture in the air is called ______________________ 6.The amount of water vapor in the air is called_______________________ _____ 7. What happens when air gets warmer? a. It can hold less water vapor. b. It can hold more water vapor. c. It cannot hold water vapor. d. It holds as much water vapor as before. Original content Copyright © by Holt, Rinehart and Winston. Additions and changes to the original content are the responsibility of the instructor. Holt Science and Technology 14 Understanding Weather Name _______________________________Class ____ Date ________ p. 162 Relative Humidity p. 39 relative humidity saturated 8.The amount of water vapor in the air compared to the most water vapor the air can hold is called the ______________________. 9.When the air holds all the water it can at a certain temperature, the air is .______________________ Factors Affecting Relative Humidity p. 40 increases decrease 10. If the amount of water vapor in the air stays the same, but the air gets cooler, the relative humidity ______________________. 11. If the amount of water vapor in the air stays the same, but the air gets warmer, the relative humidity ______________________. Measuring Relative Humidity p. 40 _____ 12. How do you measure the relative humidity? a. Use only a wet-bulb thermometer. b. Use only a dry-bulb thermometer. c. Use a psychrometer and a special table. d. Cover a thermometer with a damp cloth. How a W et-Bulb Thermometer Works p. 41 _____ 13. What does a wet-bulb thermometer do? a. It measures temperature. b. It measures relative humidity. c. It measures condensation. d. It measures humidity. Original content Copyright © by Holt, Rinehart and Winston. Additions and changes to the original content are the responsibility of the instructor. Holt Science and Technology 15 Understanding Weather Name _______________________________Class ____ Date ________ p. 162 CONDENSATION P. 41 _____ 14. What is it called when a gas changes to a liquid? a. evaporation c. humidity b. condensation d. water vapor ____ 15. When do water droplets form on the outside of a glass of ice water? a. when the air is saturated and then cools c. when the air is very warm b. when the relative humidity goes up d. when the relative humidity is 99% Dew Point p. 41 _____ 16. What happens when air reaches its dew point? a. Water evaporates. c. Ice melts. b. The air becomes saturated. d. The air gets cooler. CLOUDS P. 42 _____ 17. What is a cloud made of? a. gases c. water droplets b. warm air d. rain or snow Cumulus Clouds p. 42 cumulus cumulonimbus 18. A thunderstorm comes from a ______________________ cloud. 19. A puffy, white cloud with a flat bottom is a ______________________ cloud. Stratus Clouds p. 42 stratus nimbostratus fog 20. A dark cloud that brings rain is a ___________________________ cloud. 21. A cloud that forms near the ground is ______________________. 22. Clouds that cover a large area are ______________________ clouds. Original content Copyright © by Holt, Rinehart and Winston. Additions and changes to the original content are the responsibility of the instructor. Holt Science and Technology 16 Understanding Weather Name _______________________________Class ____ Date ________ p. 162 Cirrus Clouds p. 43 _____ 23. What can you predict if cirrus clouds get thicker? a. It will rain. c. The weather will change. b. It will get colder. d. The weather will turn fair. Clouds and Altitude p. 43 cirro- alto- 24. Clouds that form in middle altitudes are described as ______________________. 25. Clouds that form in high altitudes are described as ______________________. PRECIPITATION P. 44 _____ 26. Which best defines precipitation? a. evaporation b. any form of water falling to Earth c. runoff d. water going from Earth into the air _____ 27. What is the most common form of precipitation? a. rain c. sleet b. snow d. hail _____ 28. How does sleet differ from snow? a. It is not precipitation. c. It forms in cold weather. b. It starts as rain. d. It falls as single crystals. _____ 29. How does snow form? a. Water drops get larger. c. The wind blows rain upwards. b. Rain falls and freezes. d. Water vapor changes to a solid. _____ 30. What makes hail damaging to things on Earth? a. It is precipitation. c. It is balls of ice. b. It happens in cold weather. d. It comes in strong winds. Original content Copyright © by Holt, Rinehart and Winston. Additions and changes to the original content are the responsibility of the instructor. Holt Science and Technology 15 Understanding Weather