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The blocks they used to build the pyramids were cut out of limestone, a sedimentary rock formed when layers of soil are deposited on top of each other. The results obtained by Geologie Quebec from systematic mapping coverage indicate the presence of a wide variety of biotite-, hornblende- and pyroxene-bearing plutonic rocks, ranging in composition from felsic to ultramafic, and numerous, isolated belts of variably metamorphosed volcanic and sedimentary rocks (Fig. Sketches of earth strata illustrate how superheated water and steam penetrate pores in volcanic rock and bubble up through sedimentary rock and the earth's crust. |
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