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Text 2 D ensity

By the density of rock is meant the mass contained in the unit volume of its solid phase. It depends upon the density of mineral grains entering into composition of the rock, upon the density of cementing substances and the proportionate content of minerals and cement. The density of rock-forming minerals varies largely within a range of 1900-3500 kg/mJ, but rocks may also contain even heavier minerals. The density of rocks is habitually somewhat inferior to that of the rock-forming minerals. The density of magmatie rocks is, as a rule, greater than that of sedimentary rocks, this being due to the presence of heavy ferromagnesian silicates. It declines with increasing proportion of quartz in the rock. The density of sedimentary rocks

1 Learn the meaning of the following words, word-combinations and word groups:

triaxial, uniform, compressibility, volumetric, boundary, dwindle, permeability, submontane, crumble, dissimilar, shifting, gliding, displacement, enhancement, lattice, schistosity, segregate, ambient, massif, strata, acceleration, gravity, fluid.

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