Identifying Volcanic Rocks

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Method 1. Identifying Igneous Rocks. Magma is molten rock that flows beneath the earth 's surface. The location of the formation of the rock, as well as how fast the magma cools will determine the type of igneous rock. Intrusive rocks form from the cooling of magma deep beneath the earths surface..

Thus, most field cl.ifications of volcanic rocks rely on the few phenocrysts we can see or the rock's color. The latter can be especially unreliable, but often it is the only clue we have. We shall attempt to rely on texture, color and phenocryts to identify our volcanic rock specimens..These are rocks created by volcanic action but deposited by mechanisms similar to sedimentary rocks. Some people cl.ify them as volcanic, others as sedimentary. Unconsolidated powder with occasional larger fragments: ash; Small rock pellets: lapilli; Large fragments, hand-sized and up:s; Consolidated ash or lapilli: tuff; Large .Other fun types of rocks include the Official State Rocks of the United States Twenty-five states have one the fad from the 80s and 90sed Pet Rocks, and the Thunder Egg, which is a solid, agate-filled lump found in certain volcanic lands..

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