Igneous Rocks Key Definitions 0.0 / 5 ? GeologyIgneous RocksASOCR Created by: SophieDanielCreated on: 29-12-15 10:37 Igneous Rocks Cooled from magma 1 of 12 Magma Molten rock 2 of 12 Lava Molten rocks that cools at the surface 3 of 12 Silicic Igneous Rocks Have a composition rich in silica - of more than 66% and are light coloured (leurocratic) 4 of 12 Intermediate Igneous Rocks Silica content of 66-52% and are grey (mesocratic) 5 of 12 Magic Igneous Rocks Silica content of 52-45% and are dark (melanocratic) 6 of 12 Ultramafic Igneous Rocks Silica content less than 45% 7 of 12 Felsic Minerals Light coloured and silica rich 8 of 12 Cooling Igneous rocks may be at the surface or at depth 9 of 12 Extrusive The general term for all igneous rocks that cool at the surface 10 of 12 Hypabyssal When he igneous rocks form at relatively shallow depth below the surface 11 of 12 Plutonic When igneous rocks form deep below the surface. 12 of 12
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