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Internal Forces of the Earth

Internal Forces of the Earth. 4 layers of earth 1-crust Where people live; continents stuck into crust 2-mantle “hot liquid rock-magma”; like hot caramel 3-outer core 4-inner core. Plate Tectonics. Crust is divided into stiff, moving plates. RING OF FIRE.

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Internal Forces of the Earth

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  1. Internal Forces of the Earth • 4 layers of earth • 1-crust • Where people live; continents stuck into crust • 2-mantle • “hot liquid rock-magma”; like hot caramel • 3-outer core • 4-inner core

  2. Plate Tectonics • Crust is divided into stiff, moving plates

  3. RING OF FIRE • AREA IN PACIFIC WHERE PLATE IS THINNER • MORE EARTHQUAKES & VOLCANOES

  4. VOLCANOEhttp://www.volcano.si.edu/world/region.cfm?rnum=13S BY REGION

  5. 3-MIDDLE OF PLATE • LESS INTERNAL FORCES—HEAT & PRESSURE • MORE EXTERNAL FORCES-WIND & WATER

  6. EXAMPLE OF SPREADING-- Plate A Plate B

  7. Mid Oceanic Ridge “underwater Volcano” Sea floor spreads

  8. Plate movement • FOLDING

  9. PLATES COLLIDING 2 • FAULT- PLATE CRACKS & MOVES

  10. Trench Creation—SUBDUCTIONSMALLER PLATE GOES UP/BIG PLATE GOES DOWN

  11. TRANSFORM—PLATES SLIDE PAST

  12. EARTHQUAKE ZONESPLATES SLIDE PAST EACH OTHER

  13. Results of internal forces • Types of landforms created • Mountains, valleys, volcanoes, islands • What do they look like? • Higher, jagged, steep slopes • Primary landforms • Created by heat & pressure, plate movement

  14. EXTERNAL FORCES • Rock weathering • Water • -breaks rock down • Transports rock

  15. wind • Transports rocks & minerals • Breaks down rocks (2 rocks run into each other0 • Creates sand dunes

  16. glaciers • Heavy ice • Flattens land • Picks up sediment • Leaves some parts behind as it moves • Creates: • Plains • Fertile land • Carves out rivers • Leaves ice that will melt to become lakes

  17. Results of external forces • TYPES OF LANDFORMS • Plains, plateaus, alluvial fans, deltas, • LOOK LIKE? • Lower in elevation, rounded, smaller • SECONDARY • Created by external forces like wind, water, glaciers

  18. Continental drift theory • PANGAEA Evidence #1 -Jigsaw Puzzle All continents Seem to fit together

  19. EVIDENCE • 2-fossil remains

  20. Evidence #3-sea floor spreadinghttp://www.tectonics.caltech.edu/outreach/animations/drift.html • Sea floor spreading

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