Taken almost entirely from “Life Science” a Carlsbad Cavern National Park Middle School Biology Curriculum guide with permission - http://www.nps.gov/cave/forteachers/curriculummaterials.htm)
Taken almost entirely from “Life Science” a Carlsbad Cavern National Park Middle School Biology Curriculum guide with permission - http://www.nps.gov/cave/forteachers/curriculummaterials.htm)
