Plate Tectonics Assignments

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Across
  1. 2. Place where two tectonic plates slide horizontally past each another that is characterized by long faults and shallow earthquakes.
  2. 4. Wegener’s hypothesis that Earth’s continents were joined as a single landmass, called Pangaea, that broke apart about 200 million years ago and slowly moved to their present situations.
  3. 5. Device used to map the ocean floor that detects small changes in magnetic fields.
  4. 6. Hess’s theory that new ocean crust is formed at mid-ocean ridges and destroyed at deep-sea trenches; occurs in a continuous cycle of magma intrusion and spreading.
  5. 10. Line on a map that connects points of the same age.
  6. 11. Place where two of Earth’s tectonic plates are moving toward each other; is associated with trenches, inlands arcs, and folded mountains.
  7. 12. Ancient landmass made up of all the continents that began to break apart about 200 million years ago.
  8. 13. Tectonic process associated with convection currents in Earth’s mantle that occurs when the weight of an elevated ridge pushes an oceanic plate toward a subduction zone.
  9. 14. Tectonic process associated with convection currents in Earth’s mantle that occurs as the weight of the subducting plate pulls the trailing lithosphere into a subduction zone.
Down
  1. 1. Study of Earth’s magnetic record using data gathered from iron-bearing minerals in rocks that have recorded the orientation of Earth’s magnetic field at the time of their formation.
  2. 2. States that Earth’s crust and upper mantle are broken into plates, which are huge rock slabs that move in different directions and at different rates over Earth’s surface.
  3. 3. Long, narrow depression that forms when continental crust begins to separate at a divergent boundary.
  4. 7. Process by which one tectonic plate slips beneath another tectonic plate.
  5. 8. Place where two of Earth’s tectonic plates are moving apart; is associated with volcanism, earthquakes, and high heat flow, and is found primarily on the seafloor.
  6. 9. Changes in Earth’s magnetic field over geologic time, recorded in ocean-floor rocks and continental basalt flows.