plate tectonic

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Across
  1. 3. - Name of the supercontinent in the idea of continental drift that our continents today were all joined together to form. Covered about one third of Earth’s surface.
  2. 7. - When the force of gravity moves a plate downward and away from the ridge.
  3. 10. Convection (Current) - The movement of a fluid in the mantle, caused by differences in density and temperature, that transfers heat from one part of the fluid to another. Drives tectonic plate motion.
  4. 11. The layer of hot, solid material between Earth's crust and core. contains more dense elements than the crust such as magnesium and iron.
  5. 12. the division division of the Earth into different layers based on their physical properties. lithosphere, asthenosphere, mesosphere, outer core, inner core of the Earth into different layers based on their physical properties. lithosphere, asthenosphere, mesosphere, outer core, inner core
  6. 15. Zone - an area where oceanic crust sinks beneath continental crust at a deep-ocean trench and back into the mantle at a convergent plate boundary.
  7. 16. the rigid outer part of the earth, consisting of the crust and upper mantle. broken into pieces called tectonic plates.
  8. 17. - Gravitational force pulling a tectonic plate as it subducts deep into the mantle.
  9. 19. The soft viscous layer of the upper mantle on which the lithosphere floats.
  10. 20. of Plate Tectonics - States that Earth’s lithosphere is broken into huge, moving slabs of rock driven by convection currents in the mantle.
Down
  1. 1. Reversal - A switch in the direction of Earth’s magnetic field so that the magnetic north pole becomes the magnetic south pole and the magnetic south pole becomes the magnetic north pole.
  2. 2. - The geologist that used sonar to discover seafloor spreading at a mid ocean ridge.
  3. 4. - (1880-1930): Continental drift (1915) hypothesized that the continents were slowly drifting around the Earth. His hypothesis was not accepted until the 1950’s, when numerous discoveries provided conclusive evidence (plate tectonics).
  4. 5. The strong, lower part of the mantle between the asthenosphere and the outer core
  5. 6. - The hypothesis that today’s continents were once part of a single land mass (Pangaea) and drifted to their present day location.
  6. 8. The central part of the earth below the mantle, contains the most dense elements of Earth's interior.
  7. 9. Spreading - The process by which new oceanic lithosphere forms as magma rises toward the surface and solidifies.
  8. 13. Earth's outermost layer, made of primarily less dense materials called silicates. Classified as oceanic and continental crust.
  9. 14. crust, mantle, core based on chemical makeup of matter
  10. 18. - Slabs of continental and oceanic crust that move slowly on top of the asthenosphere.