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(tshecrt) (nilerwk (rpemcul) (arpw)

According to Convection Theory, rocks in the mantle soften expand and rise. When they reach the base of the crust they move horizontally and cool. The cool material sinks. All of this rising and sinking make the crust bulge, buckle and crack.

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(tshecrt) (nilerwk (rpemcul) (arpw)

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  1. According to Convection Theory, rocks in the mantle soften expand and rise. When they reach the base of the crust they move horizontally and cool. The cool material sinks. All of this rising and sinking make the crust bulge, buckle and crack. Unscramble the letters in parentheses, and write in the space provided what else you think the molten material might cause the crust to do. (tshecrt) (nilerwk (rpemcul) (arpw)

  2. PLATE MOVEMENT AND CONTINENTAL GROWTH 8.4

  3. RECONSTRUCTING THE PAST • SCIENTISTS USE • ROCKS IN MOUNTAINS LIKE APPALACHAIN AND URAL MTNS. • AGE OF ROCKS IN OCEAN BASINS • FOSSILS • LAND AREAS – TROPICAL AND POLAR REVERSES

  4. Pathalassa Ocean Pangaea Tethys Sea 200 million years ago Plate movements have caused the positions of Earth’s landmasses to shift over time. Scientists think that all continents were once part of a single landmass they call Pangaea.

  5. Laurasia Gondwana 180 million years ago

  6. North America Asia Africa South America India Australia Antarctica 65 million years ago

  7. North America Europe Asia Africa South America Australia Antarctica Modern Day

  8. Continental Growth Canadian Shield Platform The North American craton The shapes of the landmasses have also changed. At the core of each continent is a craton, the oldest rock on the continent.

  9. Sources of Continental Growth • DEEP SEA SEDIMENTS – SCRAPED OFF • IGNEOUS ROCK – PLUTONS, VOLCANOES AT SUBDUCTION BOUNDARIES • RIVER SEDIMENTS – MISSISSIPPI RIVER DELTA • TERRANES – LARGE BLOCK OF LITHOSPHERIC PLATE THAT HAS BEEN MOVED, OFTEN THOUSANDS OF KM, AND ATTACHED TO THE EDGE OF THE CONTINENT

  10. REVIEW • Plate Boundary Overview

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