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Today…

Today…. Get out…. The Plan…. Review Volcanoes and Earth History Homework: Study for test. Pencil Catastrophic Events Map. Review 1. A. B. Made by magma pushing up and cooling before if breaks the surface. Made by lava running over the land and piling up. Review 2. Review 3.

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Today…

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  1. Today… Get out… The Plan… Review Volcanoes and Earth History Homework: Study for test • Pencil • Catastrophic Events Map

  2. Review 1 A B Made by magma pushing up and cooling before if breaks the surface Made by lava running over the land and piling up

  3. Review 2

  4. Review 3 What is the difference between a lahar and a pyroclastic flow? What type of volcano would cause both? • A lahar is a flood of water, mud and debris • A pyroclastic flow is a hot cloud of rock particles, ash and gas that flows up to 100 mph • A composite volcano would have both

  5. Review 4 – Identify the volcanoes and tell where they are found • Composite/Strato Volcanoes • Mostly near subduction zones • Shield Volcano • Where plates diverge - “rifts” • Hot spots • Cinder Cone • On the sides, or near, composite and shield volcanoes

  6. 5. How do the characteristics of these volcanoes compare? • Viscosity: • Gas content: • Eruption: • Viscosity: • Gas content: • Eruption: Low High High Low Explosive Lava flows

  7. 6. Describe the difference between an extinct volcano and a dormant volcano • Extinct: not erupting and not likely to erupt again • Dormant: not erupting and likely to erupt again

  8. 7. Types of igneous rocks • Explain the difference between intrusive and extrusive igneous rocks • Intrusive igneous rocks cool underground and have large crystals • Extrusive igneous rocks cool on the surface and have small crystals

  9. 8. Describe how igneous rock could become sedimentary rock. • Igneous rock cools from being hot magma and over lots of years is weathered into small pieces. Those pieces are eventually compacted and cemented together into sedimentary rock.

  10. 9. Fill in the rock cycle Weathering and erosion Compacting cementing, layering Igneous Sedimentary Rock Cooling Heat and pressure Magma Metamorphic Rock Melting

  11. 10. What are three ways life has affected the history earth? • Photosynthesizing bacteria created oxygen • New rocks were formed • Coral • Limestone • Coal • Rocks are weathered by plants

  12. 11. How do they find ages of fossils? • Superposition – The placement in the layers tells us relative age • Actual age is through the chemical composition

  13. Review - 12 • What caused this? • What effects could it have had? • An impact from a space object caused the crater to form • It changed the landscape by creating the crater and could have caused a change in biodiversity (life).

  14. “I can… ” Test is Thursday • Study: • Knowledge Map items: • 65-97 • “I can’s…”: • All Volcanoes and Earth History

  15. Today: Test Day • Plate boundaries map • Moon observations • Have a pencil ready • Shields go to Person 1 and 3 • Any last minute questions? When done quietly: Read Do other homework Do squiggle

  16. Learning Check #20Have Your Graph Out

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