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