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.

Question

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.

opcode · Answer

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.