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Details Title: Igneous Vocabulary Description: Chapter 6 vocab Total Flash Cards: 20 Created: 01/28/2005 11:07:46	To study from this set of flash cards, or to create your own your own study flash cards, register HERE. If you are already a registered user, CLICK HERE.
Cards Term igneous rock Definition any rock formed by the cooling and hardening of hot liquid rock Term magma Definition hot liquid rock beneath the earth’s surface Term lava Definition magma that reaches the earth’s surface Term intrusive Definition igneous rock that forms deep within the earth Term extrusive Definition igneous rock that forms from lava at the earth’s surface Term fine grained texture Definition igneous rock that has very small or no visible crystals and indicates that the rock cooled very fast Term coarse grained textures Definition igneous rock that has large crystal faces, which indicates that the rock cooled very slowly Term chemical composition Definition what the rock is made from Term light colored or granitic Definition indicates the rock contains minerals like quartz and feldspars which are high in silica and low in iron Term dark colored or basaltic Definition indicates that the rock contains minerals such as olivine and pyroxene which are high in iron, calcium or magnesium Term porphyry (porphyritic) Definition igneous rock that has changed and thus has two or more different sized mineral crystals Term intrusions . Definition irregular formation of intrusive rock formed by magma beneath the surface of the earth as it slips into the cracks and crevices of other rock Term batholith Definition huge, irregularly shaped intrusion that extends deep into the earth’s crust. Generally has an exposed area larger that 100 square km Term laccolith Definition domelike intrusion that pushes the overlying rocks(the rocks above it) into an arch and has a flat floor Term sill Definition sheetlike mass of igneous rock that lays horizontally between rock layers Term dike Definition narrow, flat formation of igneous rock formed in the vertical cracks in the existing rocks Term lava plateau Definition layers of lava that build up on a flat area on the Earth’s surface. These are directly related to lava flows and fissures Term fissures Definition large cracks in the Earth’s surface where lava can ooze out onto the ground Term lava flow Definition any flow of lava on the surface of the Earth due to fissures or volcanoes Term volcanic neck Definition formed when magma hardens inside of the vent of a volcano. The rock that makes up the “neck” is harder than the surrounding volcanic cone material. Over time, the cone material is eroded away leaving only the “neck” remaining.