As air rises, it transfers heat from the surface of Earth to the upper levels of the atmosphere in a process called . Scientists have found that the most destructive and deadly tornadoes occur from rotating thunderstorms called , which have a well-defined circulation. The effect is what causes the rotation of a hurricane.

Which of these is a disadvantage of hydrogen fuel cells? a. engines that use hydrogen fuel are more efficient than gasoline-powered engines. b. the only emission produced by hydrogen fuel cells is water. c. hydrogen fuel is continually available and useful for heating. d. hydrogen fuel is often purified in a process that emits lots of greenhouse gases.