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Rock Cycle

Rock Cycle. Goals. You will be able to identify the basic characteristics of different types of rocks You will be able to label and identify all of the steps in the rock cycle and locate where specific types of rock are formed. A picture of the Cycle…. 3 Main Classifications.

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Rock Cycle

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  1. Rock Cycle

  2. Goals • You will be able to identify the basic characteristics of different types of rocks • You will be able to label and identify all of the steps in the rock cycle and locate where specific types of rock are formed.

  3. A picture of the Cycle…

  4. 3 Main Classifications • - Igneous- Rocks formed from previously melted rocks • -Sedimentary- Rocks formed from fragments of other rocks and minerals that have undergone lithification • -Metamorphic- Rock that has changed from one type to another

  5. Igneous • Most often associated with Volcanoes. • Classified by texture and mineral composition

  6. Igneous • Molten rock from some source cools into solid rocks. • 2 main classifications • Intrusive • Extrusive

  7. Igneous  Intrusive • Igneous rocks that “intrude” into the space other rocks are already occupying

  8. Igneous  Intrusive • The depth and temperature of where the rock form determine the physical properties of the rock.

  9. Igneous  Intrusive (Course Grain) • Large xl’s (crystals) indicate the rock formed at high temperatures over a very long time. Course Grained Granite

  10. Igneous  Intrusive (Fine Grain) • Small xl’s indicate the rock formed very quickly. The smaller the xl, the faster the formation Fine Grained Granite

  11. Igneous Extrusive • Rocks that are produced when magma from below the surface becomes lava and cools. Lava from volcanic eruption

  12. Igneous Extrusive • Depending on the type or eruption, different materials are formed. Fast cooling, large volume of dissolved gasses- Pumice Extremely fast cooling, no dissolved gasses, results in glassy texture- Obsidian

  13. Sedimentary

  14. Sedimentary • Sedimentary rocks are formed from particulates from other rocks. These particulates are cemented or compacted together.

  15. Sedimentary • 75% of all rock outcrops on continents are sedimentary. • Only 5% of the Earth’s crust is Sedimentary.

  16. Sedimentary- Lithification • Cementation and compaction are the methods that form Sedimentary Rocks.

  17. Sedimentary • Limestone is highly porous and will hold water.

  18. Sedimentary • 2 classes of sedimentary rocks • Detrital • Chemical

  19. SedimentaryDetrital • These are chunks of other rocks that have broken off for some reason. Gravel Breccia

  20. Sedimentary  Detrital • Sandstone and shale are made from sand and clay respectively.

  21. Sedimentary • The chunks come from weathering and erosion. • Weathering- above ground • Erosion- associated with water

  22. Sedimentary  Detrital • The type of detrital sedimentary rock is determined by the size of the particle.

  23. Sedimentary Chemical • Rocks that form when dissolved materials precipitate out of solution and form rocks. Dover, England- Limestone Coquina- Seashells that have fragmented and cemented together

  24. Sedimentary Chemical • Evaporites- Rocks that form when water evaporates and leaves dissolved minerals behind. Salt flats that result from water picking up salt and other minerals like calcium carbonate in the mountains and running down to a lakebed where the water evaporates.

  25. Metamorphic • Literally- rocks that have changed Gneiss- More aligned than most other types of rock, variable mineral composition Michaelangelo’s David- Marble- Started as limestone that was heated

  26. Metamorphism • Types • Regional • Contact

  27. Metamorphism  Regional • Most common type • Large scale deformations • Usually caused by pressure from the tectonic plates squeezing rocks

  28. Metamorphism  Regional • Most mountain ranges will result in regional metamorphism.

  29. Metamorphism  Contact • Happens in places where magma or lava partially melt rocks and change them.

  30. Grades of Metamorphism • Low grade- Rocks are subjected to temperatures and pressures only slightly greater than their original environment. Slate- started as shale

  31. Grades of Metamorphism • High grade- results from situations where temperatures are much higher than when the rock formed. Foliation- flat characteristic of the rock Visible seams and color variations in those indicate high pressure squeezing of soft (melted) material.

  32. Metamorphic • Agents of metamorphism • Heat • Pressure • Chemical Change

  33. Metamorphic  Heat • Usually associated with contact metamorphism.

  34. Metamorphic  Pressure • Caused almost purely by squeezing the rocks together.

  35. Metamorphic  Chemical • A solvent, typically water, dissolves and/or deposits minerals.

  36. Characteristics of Metamophosed Rocks • Tend to be more organized. Non-foliated granite might become foliated Gneiss. Gneiss Granite

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