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Igneous Rocks

Igneous Rocks. Today’s Goal: Identify different igneous rock samples. Homework: Complete igneous definitions on back of lab. . Warm-up: Please take out your DR homework. Then, in your science journal . Draw a little picture!.

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Igneous Rocks

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  1. Igneous Rocks Today’s Goal: Identify different igneous rock samples Homework: Complete igneous definitions on back of lab. Warm-up: Please take out your DR homework. Then, in your science journal Draw a little picture! What word would you use to describe the texture of this rock? Explain how it probably formed.

  2. Igneous Online Activity

  3. Rock Cycle Chart Igneous Sedimentary METamorphic Hardened sediment Rock that’s been partially melted or changed Cooled, solidified magma Definition: What steps need to occur to form this type of rock? Examples: Parent rock weathers Sediment piles up in layers Layers get compacted and cemented together Heat and pressure Chemical reactions Parent rock starts to re-crystallize Parent rock melts Magma cools into new rock Granite, obsidian, basalt, pumice Sandstone, shale, conglomerate Slate, gneiss, schist

  4. Igneous Rock • “fire” Latin for… • Formation  • Characteristics  Cooled, solidified magma Different igneous rocks are characterized by their texture and composition. Same composition, different texture.

  5. Igneous Rock • “fire” Latin for… • Formation  • Characteristics  Cooled, solidified magma Different igneous rocks are characterized by their texture and composition. Same texture, different composition.

  6. Origins of Igneous Rock magma • Form from _________  melted rock • Factors that affect formation of magma Magma  in the ground Lava  above ground • Composition • Pressure • Temperature A change in these factors will cause a change in melting point.

  7. Igneous Landforms Intrusion When magma cuts through other rock layers and solidifies into igneous rock

  8. Devil’s Tower, WY igneous sedimentary

  9. Devil’s Tower, WY

  10. Composition and Texture Coarse-grained Fine-grained Felsic Mafic

  11. Felsic/Mafic What’s it made of?

  12. Igneous Rock Composition Write this down in your science journal: Granite Basalt Igneous rock composition: Felsic  Mafic  Light colored, less dense; Rich in silica (quartz), aluminum, potassium Dark colored, more dense; Rich in iron and magnesium; low silicate content

  13. Composition of the Crust

  14. Different Igneous Textures Fine-grained texture Coarse-grained texture Texture is directly related to… Porphyritic texture cooling rate Glassy texture Both coarse and fine grains Extremely fine

  15. Intrusive vs. Extrusive Intrusive  Igneous rock formed within the earth Extrusive  Igneous rock formed at the earth’s surface (from lava) Both Intrusive AND Extrusive Extrusive (fast cooling) Intrusive (slow cooling) (slow… then fast) Texture  Texture  Texture  coarse porphyritic fine

  16. Scoria and Obsidian Extrusive (air bubbles form as magma rises and gas escapes) Extrusive (cools too fast for crystals to form at all) Texture  Texture  Glassy (extremely fine) Fine, or vesicular (with air bubbles)

  17. Obsidian

  18. air bubbles Slow Cooling; Coarse Grained Medium to Fast Cooling; Fine Grained Very Fast Cooling; Glassy or Vesicular Gabbro Basalt Scoria Diorite Andesite (porphyritic) Granite Rhyolite Pumice Obsidian

  19. Igneous Rocks Today’s Goal: Complete the Igneous Rock lab Homework: Study for igneous rocks quiz tomorrow Warm-up: Fill in the Igneous Review worksheet (half sheet).

  20. cooled magma or lava afic elsic white or light beige black or dark grey Silica (quartz) Iron (no silica) higher lower oarse ine orphyritic slow fast 2-stage intrusive extrusive both NO!

  21. air bubbles Slow Cooling; Coarse Grained Medium to Fast Cooling; Fine Grained Very Fast Cooling; Glassy or Vesicular Gabbro Basalt Scoria Diorite Andesite (porphyritic) Granite Rhyolite Pumice Obsidian

  22. Extension Questions

  23. Igneous Quiz • Today’s Goal: • Take quiz on igneous rocks • Compare the three types of sedimentary rock. • Homework: DR 2.3 “Sedimentary Rock” due Mon. • Igneous Lab due Mon. (academic only) Warm-up: Please clear your area except for your completed igneous lab (Adv. science only). Pass the stapler around.

  24. Click to continue on to the Igneous Post Lab

  25. Slow Cooling; Coarse Grained Fast Cooling; Fine Grained Very Fast Cooling; Glassy or Vesicular

  26. When you finish your quiz, please… • Bring it up and place it in the pile. • Begin on DR 2.3 “Sedimentary Rock”

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