1 / 29

Plate Tectonics

Plate Tectonics. Plate Tectonics is a theory that describes the formation, movements, and interactions of Earth’s plates. Alfred Wegener, a German meteorologist, proposed a hypothesis called Continental Drift in 1912.

paulos
Download Presentation

Plate Tectonics

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Plate Tectonics

  2. Plate Tectonics is a theory that describes the formation, movements, and interactions of Earth’s plates.

  3. Alfred Wegener, a German meteorologist, proposed a hypothesis called Continental Drift in 1912.

  4. Continental Drift supposed that the continents have moved, or drifted, from one location to another over long periods of time.

  5. Continental Drift supposed that the continents have moved, or drifted, from one location to another over long periods of time.

  6. Wegener based his idea on the following observations:

  7. The continents had similar shapes.

  8. The same fossils were found in South America and Africa.

  9. Similar rock formations were found in South America and Africa.

  10. Climate Change: Areas once covered in glaciers are now in warmer climate zones.

  11. Wegener’s idea could not explain how the continents moved.

  12. The Theory of Plate Tectonics suggests that the continents are part of the lithospheric plates.Evidence for this:

  13. Volcano, Earthquake, and Mountain Belts are located along plate boundaries.

  14. The ocean floor gets older away from a mid-ocean ridge.

  15. The rock record shows that the magnetic field of the Earth has reversed many times.

  16. Types of Plate Boundaries

  17. Divergent Boundary Rift Valleys and Mid-Ocean Ridges

  18. Convergent Boundary Deep Sea Trenches, Subduction Zones, and Mountain Ranges

  19. Convergent (2 Types)

  20. Convergent Subduction Less Dense (Continental or Oceanic Crust) More Dense (Oceanic Crust)

  21. Convergent Collision Equal Density Continental Crust

  22. Transform (Strike-Slip) Boundary San Andreas FaultDivision between North American and Pacific Plates

  23. North American Plate Pacific Plate Pacific Plate North American Plate San Andreas FaultDivision between North American and Pacific Plates

  24. Types of Plate Boundaries

  25. Causes of Plate Movement

  26. 3 HypothesesMantle ConvectionRidge PushSlab Pull

  27. Mantle Convection: The mantle moves the plates along as it convects (heats from below). Mantle Convection Animation #2

  28. Ridge Push: The accumulating magma at a mid-ocean ridge “pushes” material away.

  29. Slab Pull: When a plate subducts, it pulls the rest of the plate with it.

More Related