A rock that crystalizes from _________ must be _________. a) Magma, intrusive b) Magma, extrusive c) Magma, clastic d) Lava, intrusive\Rocks with aphanitic textures are typically formed by ______ processes. a) Extrusive b) Pyroclastic c) Intrusive d) Porphyritic An intrusive igneous rock formation that forms a tabular feature that cross cuts pre-existing strata is known as a: a) Sill b) Dike c) Stock d) Volcanic neck)A mafic igneous rock is likely to be ______ , in color. a) Light (tan, light gray, pink) b) Intermediate (medium gray or speckled black and white) c) Dark (dark gray, black) d) Bright green




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