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PHY2253 Chapter 20 Reading Worksheet How Well Have You Read Chapter 20? Use this worksheet as a guide in your reading of Chapter 20. If you use this worksheet correctly, it will also serve as a nice study guide for this chapter. Complete the “Answer” column using words and phrases from your textbook. In the column labeled “page number”, enter the page Shipman text where the answer to the item is first found. For each True/False question, I suggest you also explain the reasoning in the answer column, so that when you look back on this to study, you remember why you chose ‘true’ or ‘false’. STATEMENT form from supercooled vapor condensing on hygroscopic nuclei. What are three types of hygroscopic nuclei commonly found in the air? TRUE or FALSE: It is possible for liquid water that is supercooled to coalesce without foreign particles. The formation of larger water drops resulting from collisions between smaller drops is called . The natural mixing of ice crystals and supercooled vapor that results is precipitation is called the process. Modern day rainmaking is done by seeding the clouds with what chemical compound? is the most common form of precipitation in the lower and middle latitudes. When the dew point is below zero degrees, water vapor freezes and results in . TRUE or FALSE: Rainmaking dates by to times earlier than the 1890s. The layered stones of ice produced by repeated vertical ascents of ice pellets are called . When cooled water vapor changes directly into ice when it condenses on an object forms. Frozen rain pellets falling directly from a cloud is called . TRUE or FALSE: Frost is just frozen dew. A large body of air that has different properties from the surrounding air is called an . Temperature and are the main characteristics used to identify air masses. TRUE or FALSE: Once an air mass forms, its properties will not change as is moves over new regions of air. An air mass that is warmer than the land surface over which it moves is called a air mass. An air mass that is cooler than the land surface over which it moves is called a air mass. and are the two labels given to describe the surface of the source region over which an air mass moves. ANSWER PAGE # PHY2253 Chapter 20 Reading Worksheet Name the four labels (and their abbreviations) given to describe air mass latitudes. In terms of air mass sources, the United States lies primarily in the region. The boundary between two air masses is called a . TRUE or FALSE: Cold fronts have sharper boundaries than warm fronts. A warm front moving into a region would be indicated by the presence of . The graphical symbols used for weather mapping use a line of sharp triangles for a front. Weather mapping symbols for an front would show alternating round and triangular shapes along the same side of the front line. When a warm front advances under a cold front a occlusion will result. Two fronts moving in opposite directions can meet and become an unmoving front. TRUE or FALSE: Cyclones and anticyclones are exactly the same thing. Electric charges resulting between clouds and water droplets can cause . A is a rainstorm with thunder, lightning, and sometimes hail. What kind of clouds cause thunderstorms? What percentage of lightning occurring in the atmosphere actually reaches Earth? Lightning that occurs behind clouds or below the horizon is called lightning. TRUE or FALSE: It is completely safe to talk on a telephone during a lightning storm. If the energy from lightning heats the surrounding air to temperatures greater than degrees, a loud clap of can be heard. TRUE or FALSE: It is possible to have lightning and thunder during a snowstorm. If you hear thunder 7 seconds after seeing a lightning flash, about how many miles away is the center of the storm? Rain that falls as liquid and freezes on contact with surfaces is called . A snowstorm that is accompanied by high winds is caused a . If the temperature outside is 40 degrees F with a wind speed of 25 mph, what is the wind chill? PHY2253 Chapter 20 Reading Worksheet TRUE or FALSE: It is possible for the temperature to be too cold for snow to fall. A whirling funnel cloud produced from a thunderstorm is called a . A tornado with wind speeds I excess of 200mph is rated as an on the Fugita Scale. Most tornados in the United States occur in the , the flat region between the Appalachian and Rocky mountains. TRUE or FALSE: April, May, and June are considered to be the peak tornado months in the central U.S. A tornado watch means conditions are favorable for a tornado, but a means one has actually been spotted. When the wind speed of a tropical storm exceeds 74 mph, the storm is called a . TRUE or FALSE: Cyclones, typhoons, hurricanes, and willy-willys are the same kind of storms over different regions of the world. Peak hurricane season in the United States is in what month? The most damaging hurricane on record to hit the Units States was . The great dome of water that moves onto land when a hurricane makes landfall is called the . A category 5 hurricane has wind speeds greater than mph. An atypical contribution to the atmosphere that results from human activities is called . The burning of causes most of the atmospheric pollution on Earth. Smoke mixing with fog is called . When temperature increases with altitude rather than following the lapse rate, this is called . What 3 fossil fuels are responsible for post of our air pollution? What is worse for the environment: complete or incomplete combustion of fossil fuels? Smog formed from interactions between chemical products and sunlight is called . TRUE or FALSE: Ozone is oxygen with an extra O atom. Rain that is excessively acidic due to nitrogen oxide and sulfur dioxide is called . The major source of air pollutants is . PHY2253 Chapter 20 Reading Worksheet