OpenStudy (anonymous):
Which of the following is not true about pumice? a. Often light enough to float in water. b. Used as a decorative landscape stone. c. Composed of a mixture of minerals. d. Used as an abrasive in polish compounds.
OpenStudy (opcode):
Come on! Just do some research. "Pumice has an average porosity of 90%, and initially floats on water." So A is true. The question asks "Which of the following is NOT true about pumice?" So A can't be it. "Because this rock is so light, it is used quite often as a decorative landscape stone." So B is true too... "Ground to a powder, it is used as an abrasive in polish compounds and in Lava soap." It's also used in some makeup products to exfoliate the skin. So D is true too. Sources: http://www.fi.edu/fellows/fellow1/oct98/expert/pumice.htm http://en.wikipedia.org/wiki/Pumice That leaves us with C. Composed of a mixture of minerals.
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