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Earth’s Crust in Motion

Earth’s Crust in Motion

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Earth’s Crust in Motion

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  1. Earth’s Crust in Motion

  2. Long Island Earthquake!! • http://www.youtube.com/watch?feature=player_detailpage&v=STsn_esGbVM

  3. When the Earth’s plates are in motion, earthquakes may occur. • Tier Word • Motion-movement .

  4. STRESS • The movement causes stress in the crust. • There are 3 types of stress in the crust • Stress -pressure

  5. Musical sliders

  6. Tensional Stress (gum)

  7. Compressional Stress(trash compacter)

  8. What happens during an earthquake? • The stress builds and then releases. This is the energy in an earthquake. • An earthquake is the shaking and trembling that is caused by the movement of rock beneath Earth’s surface.

  9. Faults • Earthquakes are caused by stress at fault lines. • A fault line is found at the boundaries of two different lithospheric plates. • (it’s the faults fault! ) • haaaaaaaaaaaa

  10. Do Now • Name/Draw three types of stress in Earth’s Crust. • Shearing • Compression • tension • HW study today’s notes • Test next week • Volcanoes, earthquakes, mountain building

  11. Strike slip fault • Caused by shearing • Rocks slip past each other • San Andreas Fault

  12. Strike,slip

  13. Normal faults -the land is pulling apart or stretching. • The tension in the crust increases until the rocks fracture. • One block of land slips downward • Fracture-break

  14. Reverse (Thrust) Fault • Forms by compression • hanging wall slides up and over footwall • formed Appalachian Mountains

  15. http://www.iris.edu/gifs/animations/faults.htm

  16. http://science.howstuffworks.com/nature/natural-disasters/earthquake3.htmhttp://science.howstuffworks.com/nature/natural-disasters/earthquake3.htm

  17. Safety Tips • Have an earthquake readiness plan. • bolt bookcases to wall studs, • Find a room of the house that you can go to in case of an earthquake. It should be a spot where nothing is likely to fall on you. • Keep a supply of canned food, an up-to-date first aid kit, 3 gallons (11.4 liters) of water per person, dust masks and goggles, and a working battery-operated radio and flashlights. • Know how to turn off your gas and water mains. • .

  18. Safety

  19. Mountain Building • Takes millions of years • Caused by compression/converging forces • Formed by folding –bends in rock that form when compression shortens and thickens part of Earth’s crust

  20. Mountain Building Cont. • Syncline dip • Anti-cline = peak rock bends into an arch • Plateau =large area of flat land elevated high above sea level

  21. Colorado Plateau

  22. Folding

  23. Syncline (trace with your finger)

  24. Syncline

  25. Syncline

  26. Anticline(folded arch rock)

  27. Anti-Cline-fold

  28. Tier Words to Know for the Test and Beyond • Compress –squeeze • compressional, compressing • Geologic event (earthquakes, volcanoes) • Interior-inside • Motion -movement • Anything that starts with the prefix geo-earth • Volcanologist- studies volcanoes • Seismologist- studies earthquakes • Diverge –separate • Divergent, diverging • Converge- come together • Convergent, converging • Transform- slip past • transforming • Stress –pressure/tension • Stressful, tensional • Primary- first,main

  29. Questions to Think About Essential Questions: • Can we predict earthquakes? Can we predict when volcanoes will erupt? • What do earthquakes and volcanoes tell us about what is happening inside the earth and on the surface? • Do you have to worry about a volcanic eruption or • earthquake where you live? Why or why not?

  30. Stop

  31. Enduring Understandings: • Studying historical earthquakes and volcanic eruptions improves our understanding of earth's processes. • Although it is known where earthquakes and volcanic eruptions are likely to happen, there is currently no reliable way to predict precisely when an event will occur. • Volcanoes and earthquakes indicate the high temperatures and pressures that exist in earth's interior. • Volcanism(volcanic activity) and seismic(earthquake) activity vary across the globe

  32. Common misunderstandings • What do students typically misunderstand? • Earthquakes don’t only occur when whole plates slide past each other. • Earthquakes don’t create a gap or hole in the earth's surface. • Earthquakes don’t occur at one depth. • Lava that erupts out of a volcano does not comes from earth's core. • Earthquakes don’t cause volcanic eruptions. • Plate boundaries are not the same as faults. • Lava does not come out of all volcanic eruptions