Name Class Date. 3. In what part of the water cycle do clouds form? a. precipitation b. evaporation c. condensation d. runoff

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1 Skills Worksheet Directed Reading B Section: Water in the Air 1. What do we call the condition of the atmosphere at a certain time and place? a. the water cycle b. weather c. climate d. precipitation THE WATER CYCLE 2. How does water go from Earth into the air? a. precipitation b. condensation c. evaporation d. runoff 3. In what part of the water cycle do clouds form? a. precipitation b. evaporation c. condensation d. runoff 4. Rain, snow, sleet, and hail are forms of what? a. condensation b. evaporation c. precipitation d. runoff Holt Science and Technology 14 Understanding Weather

2 HUMIDITY 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 Circle the letter of the best answer for the question. 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. Relative Humidity the word or phrase that best completes the sentence. 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. Holt Science and Technology 15 Understanding Weather

3 Factors Affecting Relative Humidity 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 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 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. CONDENSATION 14. What is it called when a gas changes to a liquid? a. evaporation b. condensation c. humidity d. water vapor Holt Science and Technology 16 Understanding Weather

4 15. When do water droplets form on the outside of a glass of ice water? a. when the air is saturated and then cools b. when the relative humidity goes up c. when the air is very warm d. when the relative humidity is 99% Dew Point 16. What happens when air reaches its dew point? a. Water evaporates. b. The air becomes saturated. c. Ice melts. d. The air gets cooler. CLOUDS 17. What is a cloud made of? a. gases b. warm air c. water droplets d. rain or snow Cumulus Clouds the word or phrase that best completes the sentence. cumulus cumulonimbus 18. A thunderstorm comes from a cloud. 19. A puffy, white cloud with a flat bottom is a cloud. Holt Science and Technology 17 Understanding Weather

5 Stratus Clouds 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. Cirrus Clouds Circle the letter of the best answer for the question. 23. What can you predict if cirrus clouds get thicker? a. It will rain. b. It will get colder. c. The weather will change. d. The weather will turn fair. Clouds and Altitude the term that best completes the sentence. cirro- alto- 24. Clouds that form in middle altitudes are described as. 25. Clouds that form in high altitudes are described as. Holt Science and Technology 18 Understanding Weather

6 . PRECIPITATION 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 Rain 27. What is the most common form of precipitation? a. rain c. sleet b. snow d. hail Sleet and Snow 28. How does sleet differ from snow? a. It is not precipitation. b. It starts as rain. c. It forms in cold weather. d. It falls as single crystals. 29. How does snow form? a. Water drops get larger. b. Rain falls and freezes. c. The wind blows rain upwards. d. Water vapor changes to a solid. Hail 30. What makes hail damaging to things on Earth? a. It is precipitation. b. It happens in cold weather. c. It is balls of ice. d. It comes in strong winds. Holt Science and Technology 19 Understanding Weather

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