Sinkholes

Sinkholes

From BooklistGr. 4-7. This straightforward presentation introduces an unusual subject: sinkholes, naturally occurring holes in the earth's surface. Friend informs readers that the potential for sinkholes is present wherever the underlying ground structure includes certain types of easily dissolved rock; three quarters of the land in the continental U.S. has the geological potential for sinkholes. Well-focused double-page spreads provide plenty of information. Colorful photos from around the world appear on every page and illustrate particular points about the formation and ecology of sinkholes. The book ends with a glossary, bibliography, and a list of sinkhole sites (usually state or national parks) in 21 states and two Canadian provinces. Carolyn PhelanCopyright