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Chapter 16 Review Name _______________________________ Understanding the Weather Hour ___________ Score _____________ __________1. The condition of the atmosphere at a particular time and place is called the _____ . __________2. The water vapor or moisture in the air is called ___ . __________3. The ____ is the temperature to which air must be cooled to be completely saturated. _______%_4. If the air is holding as much water vapor as it can, what is the relative humidity? __________5. A ____ is made of millions of tiny water droplets or ice crystals. __________6. During a thunderstorm, the clouds making the rain and lightning are called ____. __________7. ______ is water falling in either solid or liquid form. __________8. Changes in the weather are caused by the movement of ___ ____. __________9. When a cold air mass meets a warm air mass, a ___ front forms. __________10. The boundary between two air masses is called a ____. __________11. A large electrical discharge that occurs between two oppositely charged surfaces or areas is __. __________12. Lightning occurs with all _____ . __________13. The sound we hear from the rapid expansion of air along a lightning strike is called ____. __________14. A ____ is a large, rotating tropical weather system with wind speeds of at least 74 mph. __________15. A ___ is a small, violent, rotating column of air that has high wind speeds and touches the ground. __________16. Hurricanes generally form over a warm, tropical ____ . __________17. At the center of a hurricane is the ___ . __________18. A weather _____ is a prediction of future weather conditions. __________19. A ______ is a tool used to measure the air temperature. __________20. Lines called _____ connect points on the map with equal air pressure. __________21. A ______ is an instrument used to measure the air pressure. __________22. When the temperature increases, the liquid ____ up the thermometer tube. __________23. _____ orbiting the Earth also provide images and can make measurements. __________24. The most powerful storm on Earth is the ____ because it covers such a large area. __________25. There are ___ different kinds of fronts.