Click on one of the following icons to go to that resource. Chapter Resources Click on one of the following icons to go to that resource. earth.msscience.com Image Bank Foldables Video Clips and Animations Chapter Summary Chapter Review Questions Standardized Test Practice

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Image Bank Earth

Image Bank High and Low Pressure

Image Bank Water Droplets

Image Bank Dew Point Chart

Image Bank Cloud Formation

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Foldables Weather When information is grouped into clear categories, it is easier to make sense of what you are learning. Make the following Foldable to help you understand your thoughts about weather.

Foldables Collect 2 sheets of paper and layer them about 1.25 cm apart vertically. Keep the edges level.

Fold up the bottom edges of the paper to form 4 equal tabs. Foldables Fold up the bottom edges of the paper to form 4 equal tabs.

Foldables Fold the papers and crease well to hold the tabs in place. Staple along the fold.

Foldables Label the tabs Weather, What is weather?, Weather Patterns, and Forecasting Weather as shown.

Foldables Summarize As you read the chapter, summarize what you learn under the appropriate tabs.

Video Clips Click image to view movie.

Video Clips

Reviewing Main Ideas 1 What is weather? Factors that determine weather include air pressure, wind, temperature, and the amount of moisture in the air. More water vapor can be present in warm air than in cold air. Water vapor condenses when the dew point is reached. Clouds are formed when warm, moist air rises and cools to its dew point.

Reviewing Main Ideas 1 What is weather? Rain, hail, sleet, and snow are types of precipitation.

Reviewing Main Ideas 2 Weather Patterns Fronts form when air masses with different characteristics meet. Types of fronts include cold, warm, occluded, and stationary fronts. High atmospheric pressure at Earth’s surface usually means good weather. Cloudy and stormy weather occurs under low pressure. Tornadoes, thunderstorms, hurricanes, and blizzards are examples of severe weather.

Reviewing Main Ideas 3 Weather Forecasts Meteorologists use information from radar, satellites, computers, and other weather instruments to forecast the weather. Weather maps include information about temperature and air pressure. Station models indicate weather at a particular location.

Question 1 Answer What is relative humidity? Chapter Review Question 1 What is relative humidity? Answer Relative humidity is a measure of the amount of water vapor present in the air compared to the amount needed for saturation at a specific temperature.

Question 2 Which forms in cumulonimbus clouds when the air is warm? Chapter Review Question 2 Which forms in cumulonimbus clouds when the air is warm? A. fog B. hail C. sleet D. snow

Chapter Review Answer The answer is B. Hail forms when water freezes in layers around a small nucleus of ice.

Question 3 Answer What causes lightning? Chapter Review Question 3 What causes lightning? Answer Lightning results from the flow of electric current between regions of opposite electric charge in clouds.

Chapter Review Question 4 A(n) __________ is a violently rotating column of air in contact with the ground. A. hailstorm B. hurricane C. thunderstorm D. tornado

Chapter Review Answer The answer is D. Severe thunderstorms can produce funnel clouds. If a funnel cloud comes into contact with Earth’s surface, it is called a tornado.

Chapter Review Question 5 How does the National Weather Service determine whether a winter storm is a blizzard? Answer The classification of blizzard is based on wind speed, temperature and visibility. A winter storm is a blizzard if winds reach 56 km/h, temperature is low and visibility is less than 400 m in falling or blowing snow.

Standardized Test Practice Question 1 At what temperature is the relative humidity 50% when the air contains 25 g of water vapor per cubic meter of air?

Standardized Test Practice Question 1 A. 10º B. 25º C. 40º D. 50º

Standardized Test Practice Answer The answer is C. If the relative humidity is 50% when the air contains 25 g of water vapor per cubic meter of air, the relative humidity is 100% when the air contains 50 g of water vapor per cubic meter of air.

Question 2 What type of clouds does the diagram illustrate? Standardized Test Practice Question 2 What type of clouds does the diagram illustrate?

Question 2 A. cirrus B. cumulus C. fog D. stratus Standardized Test Practice Question 2 A. cirrus B. cumulus C. fog D. stratus

Answer The answer is A. Fog is a stratus cloud near the ground. Standardized Test Practice Answer The answer is A. Fog is a stratus cloud near the ground.

Question 3 What type of precipitation is illustrated in the diagram? Standardized Test Practice Question 3 What type of precipitation is illustrated in the diagram? A. hail B. rain C. sleet D. snow

Standardized Test Practice Answer The answer is C. When the air near the ground is cold but air above is warm, sleet can form.

Question 4 What type of front is illustrated in the diagram? A. cold Standardized Test Practice Question 4 What type of front is illustrated in the diagram? A. cold B. occluded C. stationary D. warm

Standardized Test Practice Answer The answer is C. A stationary front results when neither cold air nor warm air advances.

Question 5 Which city has a cold front approaching it? Standardized Test Practice Question 5 Which city has a cold front approaching it?

A. Duluth B. Miami C. Nashville D. Springfield Standardized Test Practice A. Duluth B. Miami C. Nashville D. Springfield

Answer The answer is C. Weather fronts move from west to east. Standardized Test Practice Answer The answer is C. Weather fronts move from west to east.

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