Hurricanes, Tornadoes and Thunderstorms (video) 1. What do we call the layers of air that surrounds our planet? ____________________________________ 2. What name is used to refer to the weight of air? ____________________________________ 3. What instrument measures air pressure? ____________________________________ 4. What causes wind? _______________________________________________________________________ 5. What two properties of air contribute to the formation of thunderstorms? _______________________________________________________________________ 6. How do clouds form along cold fronts? ______________________________________________________________________________ ______________________________________________________________________________ 7. What kind of thunderstorm clouds form along cold fronts? ____________________________________ 8. Where do most tornadoes originate? _______________________________________________________________________ 9. What kind of storm has the most powerful winds on Earth? ____________________________________ 10. Why are hurricanes more destructive than tornadoes? _______________________________________________________________________ 11. Where do hurricanes originate? ____________________________________ 12. At what wind speed do tropical storms become hurricanes? ____________________________________ 13. What is the name of the opening near the center of a hurricane? ____________________________________ 14. What is the hurricane’s most destructive force? ____________________________________