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Download Do now! - MrSimonPorter
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Do now! Can you read through the brain-map you did yesterday? Last lesson • Three main rock types Three main rock types Igneous Three main rock types Sedimentary Three main rock types Metamorphic Igneous rocks From the latin “ignis” meaning fire Igneous rocks What’s the difference? Formed by the cooling of lava or magma Igneous rocks Made from crystals Igneous rocks Quick cooling forms small crystals, slow cooling forms large crystals Igneous rocks Basalt is formed by quickly cooling lava Igneous rocks Pumice is formed from lava that contains a lot of gas. It can float! Igneous rocks Obsidian is like dark glass formed when molten silica cools quickly! Igneous rocks Granite is made from magma that cools slowly underground Sedimentary rocks Sedimentary rocks Sediments like sand and mud build up at the bottom of oceans and rivers Sedimentary rocks Over millions of years pressure from successive layers forms these into sedimentary rocks Sedimentary rocks Layers! Sedimentary rocks Animals and plants can be trapped in the sediments and can form fossils Sedimentary rocks Sandstone is made from sand grains stuck together Sedimentary rocks Limestone is made from the mineral calcite which came from the beds of evaporated seas and lakes and from sea animal shells. Sedimentary rocks Conglomerate rocks are made up of large sediments like pebbles. The sediment is cemented together with dissolved minerals. Sedimentary rocks Shale are formed from clay and mud that is compacted together by pressure. Metamorphic rocks Metamorphic rocks Metamorphic rocks are rocks that have "morphed" into another kind of rock. Metamorphic rocks These rocks were once igneous or sedimentary rocks. The rocks are under tons of pressure, which causes heat build up, and this causes them to change. Metamorphic rocks These often also contain thin layers and crystals but are much harder than sedimentary rocks Metamorphic rocks Marble is limestone that has been metamorphised Metamorphic rocks Slate is metamorphised shale Metamorphic rocks Anthracite coal Identifying some rocks Mr Porter is going to give you some unnamed rock samples. Fill in the table. The group that gets the most correct wins a prize!
