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EARTH SCIENCE

Explore the fascinating theories of Continental Drift and Plate Tectonics. Originally proposed by Alfred Wegener, the Continental Drift theory suggests that Earth's continents were once joined as a single landmass, Pangaea, before drifting apart over time. Evidence from matching coastlines and geological structures supports this idea. Furthermore, the Sea Floor Spreading Theory explains how new crust forms due to plate movements. Dive into the behavior of tectonic plates, their boundaries, and the geological features they create, including ocean ridges, volcanoes, and earthquake zones.

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EARTH SCIENCE

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  1. EARTH SCIENCE

  2. Crust Mantle Outer Core Inner Core

  3. Abraham Ortelius Eduard Suess

  4. Alfred Wegener Continental Drift

  5. Continental Drift Theory In the distant past, the Earth’s continents were all joined as a single landmass and broke into pieces and eventually drifted away from each other.

  6. Evidence for His Theory South America and Africa would fit remarkably well, shoreline to shoreline.

  7. Evidence for His Theory If the N. and S. Americas were moved next to Africa and Europe, there would be a match of ancient continental rocks and tectonic (fold and fault) structures.

  8. Evidence for His Theory When Wegener placed all the continents together like a puzzle, they formed a large landmass which he called ...

  9. Why did he call it Pangaea?

  10. What made Alfred Wegener different from the other scientists that conceived the idea of drifting continents?

  11. The scientific community during Wegener’s time did not accept his proposition. What was the reason behind this?

  12. Sea Floor Spreading Theory

  13. EARTH SCIENCE

  14. Continental Drift Theory + In the distant past, the Earth’s continents were all joined as a single landmass and broke into pieces and eventually drifted away from each other. Sea Floor Spreading Theory

  15. Continental Drift Theory + It states that new crust are formed as a result of continuous plate movement. Sea Floor Spreading Theory

  16. ? PLATE TECTONICS Theory

  17. We know what PLATES are, but what do we mean by TECTONICS?

  18. “TO BUILD” “FORMATION” “DEFORMATION”

  19. Behavior of the Plates

  20. What can you say about the arrangement of the plates?

  21. What happens at tectonic plate boundaries?

  22. Give one description for each illustration.

  23. DIVERGENT

  24. CONVERGENT

  25. TRANSFORM

  26. Plate Boundaries • Divergent • Convergent • Transform

  27. Geologic Features Ocean Ridges Volcanoes Rift Valleys Trenches Subduction Zones Volcanic Island Arcs Mountain Ranges Faults Shallow Earthquakes

  28. DIVERGENT

  29. What happens in DIVERGENT boundaries?

  30. MID-OCEAN RIDGE OCEAN CRUST MAGMA MANTLE

  31. CONSEQUENCE? DIVERGENT Boundaries

  32. Spreading Ridges As plates move apart new material is erupted to fill the gap

  33. Courtesy of www.ngdc.noaa.gov

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