By comparing the density of the two rocks, Rock B has the greater density.
The density of a substance is a measure of the compactness of the particles of that substance.
The density of a substance is defined as the ratio of the mass amd the volume of that substance
The densities of the two rocks are determined as follows:
mass of rock A = 10 g
mass of rock B = 20 g
volume of the two rock = v
Density of Rock A = 10/v
Density of Rock B = 20/v
Ratio of density of Rock A and B = 1/2
Therefore, Rock B has the greater density.
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