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Plate Tectonics

Plate Tectonics. Locate different types of plate boundaries on the sea floor map. Goal: Homework: Warm-up:. DR 4.3 “Plate Tectonics” due tomorrow.

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Plate Tectonics

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  1. Plate Tectonics Locate different types of plate boundaries on the sea floor map. Goal: Homework: Warm-up: DR 4.3 “Plate Tectonics” due tomorrow In your science journal  Look at the diagram on p. 108 – 109. What happens when a continental plate and oceanic plate collide? What is this process called, and why does it happen?

  2. Plate Boundaries Animation

  3. Geology Articles

  4. Plate Boundary Diagrams On the back of your map: Transform Boundary Divergent Boundary ConvergentBoundary (oceanic/continental) ConvergentBoundary (oceanic/oceanic) ConvergentBoundary (continental/continental)

  5. Tectonic Plates

  6. Mid-Ocean Ridges

  7. Deep-Sea Trenches

  8. Plate Boundaries Draw diagrams for each of the types of plate boundaries. Goal: Homework: Warm-up: none In your science journal  After watching BrainPop, list and describe each of the three types of plate boundaries. Tell what features you’d expect to find at each type.

  9. Seafloor Map

  10. Plate Boundaries • Divergent • Convergent • Transform

  11. Plate Boundaries Animation

  12. Theory of Plate Tectonics • Lithosphere is broken up into many plates • Interaction between the plates causes continents to move and oceans to expand • Earthquakes, volcanoes, and other plate movement all caused by heat trying to escape from the Earth’s interior. So why is it called the “Theory” of Plate Tectonics?

  13. What happens at a divergent boundary? • Mid-Atlantic Ridge • Plates moving apart • Seafloor spreading • Mid-ocean ridge • Volcanic activity

  14. How does a new ocean form? Magma in the ________________ starts to push through and form a new ______. asthenosphere rift

  15. The Great Rift Valley Divergent • ___________boundary on a continent • New _______ forming ocean • Label the Great Rift Valley on your seafloor map. • Click here to see what’s happening at this rift valley.

  16. Plate Tectonics Goal: Homework: Warm-up: To draw diagrams of each type of plate boundary. none In your science journal  Look at this diagram of a convergent boundary between two oceanic plates. What causes the trench to form, and what causes the island arc to form?

  17. What happens at a transform boundary? All these “strike-slip” faults surrounding the ridge are called the “fracture zone”. • Plates move laterally past each other • Many earthquakes

  18. San Andreas Fault

  19. Seafloor Map • Also, label the large transform boundary that cuts across the East Pacific Rise. • Label the San Andreas Fault on your seafloor map.

  20. What happens at a convergent boundary? • Plate are pushed together • Depends on which types of plates are converging

  21. Convergent (oceanic/continental) • Oceanic goes under continental due to greater density • Trench is created off the coast • Mountains created on land due to rising magma • magma

  22. The Andes Mountains

  23. Convergent (oceanic/oceanic) • The OLDER oceanic plate will sink beneath the other • Trench is created in between the plates • An island arc is created due to rising magma • magma

  24. Island Arcs • Japan • Aleutian Islands, Alaska • The Philippines

  25. Convergent (continental/continental) • Both plates collide and deform • The crust thickens as mountains are pushed upward • Regional metamorphism takes place

  26. The Himalayas

  27. For a closer look at anywhere in the world click the map below:

  28. Volcanic activity at plate boundaries Animation

  29. Plate Boundaries Animation

  30. What causes the plates to move? Convection and Tectonics Animation

  31. Convection CLICK ME! RISES • Hottest magma  • Cooler magma  • These motions cause _____________ SINKS circulation

  32. How is a lava lamp like the mantle? Animation

  33. Plate Boundary Diagrams On the back of your map: Transform Boundary Divergent Boundary ConvergentBoundary (oceanic/continental) ConvergentBoundary (oceanic/oceanic) ConvergentBoundary (continental/continental)

  34. Convergent Boundary Goal: Homework: Warm-up: To complete and label the features on a profile of the seafloor. Study for plate tectonics quiz tomorrow In your science journal  Without looking at your book, notes, or map, draw and label a diagram showing a convergent boundary between continental and oceanic plates. You have 60 seconds starting…

  35. Convergent Boundary Goal: Homework: Warm-up: To complete and label the features on a profile of the seafloor. Study for plate tectonics quiz tomorrow In your science journal  Without looking at your book, notes, or map, draw and label a diagram showing a convergent boundary between continental and oceanic plates. You have 60 seconds starting… NOW!

  36. Convergent Boundary (continental/oceanic)

  37. Subduction Zones • How many different plates are there in this diagram? 1 2 3 4

  38. Subduction Zones • Label the features below:

  39. Subduction Zones • Identify the plate boundaries by placing a big letter “D” above the divergent boundary and placing a “C” above each convergent boundary. • What process is taking place along the ridge? • What process is taking place at the trenches? • During subduction, a(n) ___________ plate will sink beneath the continental plate. • 4. What causes one plate to sink while another floats? • sea floor spreading • subduction • oceanic • Oceanic crust is denser than continental because it’s more mafic in composition.

  40. Subduction Zones (continued) • Using a green colored pencil, shade in the area where the youngest ocean rocks would be found. Then, in blue, shade in the area of oldest ocean rock. Which of these areas (green or blue) would have the thickest sediment sitting on top of it, AND why? • Using a red colored pencil, color in 2 areas where you would find melting rock. What happens to the melted rock, and what landforms does it produce? • Blue would have the thickest layers of sediment because it’s older and has had more time to accumulate debris. • The melted rock (magma) rises to the surface because it’s hot (less dense) where it creates volcanoes.

  41. Subduction Zones (continued) • On your diagram, draw circular arrows like those in Figure 1 on p. 110 to show the circulation of the magma within the Earth. What is the name of this process? • 8. Plate tectonic motion is causing the ___________ Ocean to expand, while the __________ Ocean is getting smaller. • convection • Atlantic • Pacific

  42. Advanced Article Assignments • Online Quiz: • Quiz window: Thurs. 10/29 through Mon. 11/2 at 11:59 pm. • Everyone takes both quizzes. • See my website for the links. • Article Summary: • Due Wed. 11/4 (day after ½ day) • Choose ONE article of the two for the Geology Unit. • Everyone EXCEPT presenters • PowerPoint Presentation: • Wed. 11/4 • Look at rubric for requirements • Only our two presenting groups (see me after class)

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