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Sandra Friend
Books by Sandra Friend
Sinkholes
Everything young readers 12 and up ever wanted to know about these unique formations.
A sinkhole is a hole in the ground, but a very special one, appearing anywhere where rock dissolves allowing the ground above it to sink. Some sinkholes happen gradually, but others open up almost instant...
A sinkhole is a hole in the ground, but a very special one, appearing anywhere where rock dissolves allowing the ground above it to sink. Some sinkholes happen gradually, but others open up almost instant...