Tornado Small 320×306 Medium 640×611 Large 1024×978 Download Tiff Original 2400×2292 | (3.9 MB) Description A tornado is a rotating column of air which is in contact with a cloud base and the surface of the earth. Keywords disasters, nature, weather Galleries Storms Source: Edwin J. Houston, The Elements of Physical Geography, for the use of Schools, Academies, and Colleges. (Philadelphia: Eldredge & Brother, 1891) 150