Different Types of Rock 0.0 / 5 ? ChemistryRocks, ores, metals and alloysGCSEEdexcel Created by: lucyellisCreated on: 18-03-14 09:12 The Three Different Types of Rock Sedimentary Rocks Formed from layers of sediment getting buried under more layers Water gets squeezed out, fluids flowing though the pores deposite natural mineral cement. Limestone and Chalk The rock isn't formed at high temperatures or pressures, so the dead organisms aren't destroyed. They are easily eroded. Metamorphic Rocks Formed by heat and pressure on rocks over long times. Mineral structure and texture changes, but chemical composition is the same Marble is formed from limestone and chalk, high temperatures break it down and reform it in small crystals, making the texture more even and harder. Igneous Rocks Formed when molten magma cools and solidifys Contain different minerals in interlocking crystals Extrusive - Cools quickly above ground, forming small crystals e.g. basalt Intrusive - Cools slowly underground, forming big crystals, eg. granite 1 of 1
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