Geology Chapter 2.3 0.0 / 5 ? Geologyigneous rocks A2/A-levelOCR Created by: abbbywCreated on: 26-12-17 14:34 Extrusion the emission of magma onto the earth's surface where it forms a lava flow 1 of 10 Intrusions composed of igneous rock formed below earth's surface, where magma is forced into pre-existing rocks 2 of 10 Hypabyssal when igneous rocks form at relatively shallow depths below the surface 3 of 10 Plutonic when igneous rocks form deep below the surface 4 of 10 Euhedral crystals are well formed with good crystal faces 5 of 10 Equant crystals have all axes the same length 6 of 10 Sub-equant almost all axes are the same length 7 of 10 Prismatic crystals have 4 or more sides but are elongated in 1 direction 8 of 10 Anhedral crystals show poorly formed crystal faces 9 of 10 Subhedral crystals have some well-formed faces + some poorly formed faces 10 of 10
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