they ... at the bottom of large, dark clouds
appear
there is often no time to run and no place to ... from them
hide
tornadoes are so dangerous because the appear ...
suddenly
when the wind ... the ground, it is called a tornado
touches
they usually form in the summer when warm, wet air and cold, ... air meet
dry
the turning tornado moves along the ground and can ... trees and buildings in its way
break down
When the dark clouds ... the sky
fill
it's one the most ... things in nature
dangerous
this danger is a quickly turning tower of air called a ....
tornado
however, even a small tornado can do a lot of ...
damage