Density differs appreciably among the different rock types because of variations in mineralogy and porosity. Knowledge of the distribution of underground rock densities can assist in interpreting subsurface geologic structure and rock type. Igneous rocks are people who solidify from magma, a molten mixture of rock-forming minerals and usually volatiles https://sticksofrock89000.yomoblog.com/43120379/the-2-minute-rule-for-sticks-of-rock