4. Tornadoes may be hard to measure, but scientists haveagood idea where they will strike. It's true that a
tornado can hit anywhere in the world at any time. Most tornadoes happen in the central part of the United
States. This area is called Tornado Alley.
A. Where tornadoes often form
B. Measuring tornadoes
(C)How tornadoes form
D. Bad effects of tornadoes
5. There is no way to be sure that a tornado will strike. The National Weather Service (NWS) tries to help
people stay safe during tornadoes. If they put out a tornado watch, a tornado might strike. If they put out a
tornado warning, a tornado has been spotted. If there is a tornado, it's important to get to a safe place. Go
indoors. The safestplace is abasement. If you can't gettoabasement, go into aclosetor bathroom. Stay away
from windows.
A. Bad effects of tornadoes
B. Tornado safety
C. Where tornadoes often form
D. How tornadoes for