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Continental Growth

Continental Growth. **Remember** our evidence for continental drift : fossils, glacial deposits, landforms, ages of rocks, puzzle fit of continents. *These notes go on p. 17 of your INB!*. scientists use evidence found in rocks to reconstruct the past: (1) age of rocks, (2) fossils ,

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Continental Growth

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  1. Continental Growth **Remember** our evidence for continental drift: fossils, glacial deposits, landforms, ages of rocks, puzzle fit of continents *These notes go on p. 17 of your INB!*

  2. scientists use evidence found in rocks to reconstruct the past: (1) age of rocks, (2) fossils, (3) evidence of melting (subduction), (4)location on current continents, (5) glacial deposits

  3. indicates continents were once welded together in a supercontinent called Pangea • convergent boundaries (subduction & collision) destroy old crust • divergent boundaries create new crust

  4. craton- ancient core of a continent • continental rock is much older than oceanic

  5. Sources of Growth • deep sea sediments are added to end of continental plate at subduction zone • lava erupting from volcanoes creates new rock • rivers erode landforms and transport sediments to edges of continents * reasons why edges of continents do not match up!

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