rocks and the rock cycle
TRANSCRIPT
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RocksRocks and theand the Rock CycleRock Cycle
Image source: www.missouristateparks.netImage source: www.missouristateparks.net
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Can you think of some places where rocks and minerals can be found?
… and what about in cities or towns?
Rocks and minerals are all around us.
It takes millions of years for rocks to form - we must use our natural resources wisely.
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1. IGNEOUS (Latin for fire)
2. SEDIMENTARY (Latin for settle)
3. METAMORPHIC (Greek for change)
Three Types of RocksThree Types of Rocks
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• Formed when magma (the molten rock that lies under the earth’s crust) is forced to higher layers of the crust – cools & solidifies.
• There are 2 types of igneous rocks – Intrusive & extrusive
• INTRUSIVE - Formed when magma slowly solidifies inside earth. Takes thousands of years to harden. Not seen until surface rocks have been eroded away. Coarse-grained.
• EXTRUSIVE – Formed when magma ERUPTS from volcanoes or escapes through cracks to form lava. Lava cools quickly – and forms into rocks. Fine-grained, e.g. Pumice and basalt.
Igneous RocksIgneous Rocks
http://www.youtube.com/user/Sciencebox2010#p/search/0/d4XAOY-VEEI
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Igneous rock is a volcanic rock that forms when magma cools and hardens. Intrusive igneous rock solidifies underground. Extrusive igneous rock solidifies above ground.
DEFINITIONDEFINITION
Images source: www.geology.comImages source: www.geology.com
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Igneous RocksIgneous Rocks
Earth’s SurfaceEarth’s Surface
Molten RockMolten Rock
Volcanic eruptionVolcanic eruption
Igneous RockIgneous Rock
LET’S VIEW A VOLCANIC ERRUPTION!!!
http://www.youtube.com/watch?v=s2i4XS0Esks&feature=related
Image source: www.bprc.osu.edu/
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• Erosion --> rocks and minerals break down into small pieces called sediments.
• Carried by ‘the elements’ & deposited in river beds or sea beds.
• Accumulate (build-up) in layers --> pressed together by weight of new sediments. Compressed sediments are ‘cemented’ & harden to form new rock.
Sedimentary RocksSedimentary Rocks
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• Have you ever noticed layers or bands in rocks? These are the layers of sediment.
• Examples: Sandstone, limestone, chalk and shale
• Fossils are often found in sedimentary rocks. Why do you think this might be?
Sedimentary RocksSedimentary Rocks
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Sedimentary rock is a rock formed near Earth’s surface from pieces of other rocks, plant or animal remains, or by the build-up of chemical solids.
DEFINITIONDEFINITION
Images source: www.geology.com
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Sedimentary RocksSedimentary Rocks
Weight and pressure of sediment particlesWeight and pressure of sediment particles
LandLandSeaSea
http://www.youtube.com/user/Sciencebox2010#p/search/0/9Df4CtlZ0AQ
Image source: www.bprc.osu.edu/Image source: www.bprc.osu.edu/
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• Igneous and sedimentary rocks can be changed into a
different kind of rock by extreme heat or pressure – the changed rock is called metamorphic rock.
• Original rock may be forced into new arrangements, sometimes new minerals form.
• Metamorphic rocks can also change again.
Examples:Shale --> Slate Limestone --> MarbleGranite --> Granite gneiss Sandstone --> Quartzite
Metamorphic RocksMetamorphic Rocks
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Metamorphic rock is a rock formed by the transformation of existing rock, as a result of extreme heat and/ or pressure.
DEFINITIONDEFINITION
http://www.youtube.com/user/Sciencebox2010#p/search/0/ggIpPHIeJu4
Images source: www.geology.com
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Metamorphic RocksMetamorphic Rocks
http://www.youtube.com/watch?v=G7AWGhQynTY&feature=related
Image source: www.bprc.osu.edu/
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• Animation of the rock cycle: www.youtube.com/watch?v=U7YQ5vwaL98&feature=related
The Rock CycleThe Rock Cycle • Rock is constantly being changed by; heat, pressure, melting, crystallization, compaction, cementation and weathering.
• Move rock material through the states of; melts, igneous rock, sediments, sedimentary rock and metamorphic rock.
• This natural and ongoing cycle is known as the rock cycle.
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