Wood floats in water, 1 gram is defined as the mass of 1 cubic centimeter of water, a cubic centimeter of quartz weighs ~2.65 g and a cubic centimeter of galena weighs about 7.5 g. the density of these materials from highest to lowest is

First, let us calculate the density of all materials in gram per cubic centimetre (g / cm^3).

Wood = 1 g / cm^3

Quartz = 2.65 g / cm^3

Galena = 7.5 g / cm^3

So arranging the density from highest to lowest:

Galena, Quartz, Wood

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