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Plate Tectonics

Plate Tectonics

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Plate Tectonics

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  1. Plate Tectonics • Earth’s Layers • Earth’s Crust • The Lithosphere • Continental Drift • Thermal Convection • Earth’s Plates • 7 Major Plates • How Plate Tectonics Works • Plate Boundaries • Divergent Margins • Convergent Margins • Transform Boundaries • Hotspots

  2. TeachWithFergy Preview File Please enjoy this preview of your Student Version of the lesson. I’ve created this PDF for ease of viewing and to decrease the file size but of course, your lesson will be in PowerPoint format. Some slides appear blank because they have been removed. Student versions have portions of the text removed which is given in the teacher version and appear as ______ Other slides may have ........... on them, this represents writing that has been removed.

  3. Earth’s Layers • Crust • .................... • __________ • Mantle • __________ • From crust to 2900 km (1800 miles) beneath surface • Core • From mantle to center of Earth • __________ • ....................

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  5. Earth’s Crust • Two types • Continental • Includes land masses and continental shelves • __________ • Oceanic • Includes ocean basins • __________ Continental Oceanic

  6. The Lithosphere • __________ • .................... • Hard, not malleable • __________ • Increasing heat makes the rocks of the asthenosphere weaker and more malleable • ....................

  7. Continental Drift • .................... • He proposed that the continents had once been connected into one large continent • __________ • .................... • But he couldn’t say how

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  9. Continental Drift • Wegener’s proposed mechanisms • .................... • Gravity of Sun and moon • __________ • Continental drift was dismissed by scientists of the time • __________

  10. Thermal Convection • __________ • .................... • Lower temperature at the surface cools the substance and it sinks again • __________ • ....................

  11. Earth’s Plates • __________ • Plates move relative to one another • Plates move about 5-10 cm (2-4 in) per year • ....................

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  13. Earth’s Plates • 7 Major Plates • __________ • .................... • Eurasian • __________ • Indo-Australian • __________ • Antarctic

  14. Earth’s Plates • 7 Intermediate Plates • Arabian • Caribbean • __________ • __________ • __________ • Philippine Sea • ....................

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  16. Plate Boundaries • Where plates interact • __________ • Plates move away from one another • .................... • __________ • __________ • Plates slide past each other

  17. Divergent Margins • .................... • Magma rises to fill the space left by diverging plates • __________ • .................... • Land masses at divergent boundaries are higher than the new crust • __________ • Wider rifts lead to thinner and thinner crust, eventually leading to the formation of a new ocean • __________

  18. Divergent Margins

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  21. Convergent Margins • __________ • __________ • __________ • __________ • .................... • __________

  22. Convergent Margins • .................... • __________ • Ocean floor rocks <200 million years old • Continental rocks >4 billion years old • Eventually, subducted material heats up and mixes back in with the mantle • __________

  23. Convergent Margins • .................... • __________ • Both oceanic plates: island arc • Subducting plate can also move backwards, causing the overlying plate to stretch, forming a basin behind the arc • __________

  24. Convergent Margins • __________ • __________ • __________ • __________ • __________ • __________

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  26. Convergent Margins • When continental plates meet, mountains are formed • __________ • .................... • Subduction is a third mechanism of mountain building • __________

  27. Convergent Margins

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  29. Transform Boundaries • __________ • Plate edges rough • Can get stuck to one another temporarily • ....................

  30. Hotspots • __________ • .................... • __________ • Heat plumes, independent of plate above (stationary) • Volcano formed, then plate moves, carrying volcano away from plume • Another volcano then forms • First volcano erodes over time and sinks beneath the surface

  31. Hotspots

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  34. Check Your Understanding • __________ • __________ • __________ • __________ • __________ • __________ • __________ • __________ • __________ • __________ • __________ • __________ • __________ • __________ • __________