Plate Tectonic Theory

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Across
  1. 6. A dog-shaped, mammal-like meat-eating reptile whose fossils were discovered in Africa and South America
  2. 7. Deep and narrow depression in the seafloor where the subducted plate moves into the asthenosphere
  3. 8. Boundary where two tectonic plates slide past each other.
  4. 10. A supercontinent in the southern hemisphere made of present day South America, Africa, Antarctica, and Australia
  5. 11. ____________ current: A circular movement of fluids caused by the rising of hotter, less dense fluid and the falling of cooler, denser fluid
  6. 12. The process in which a denser plate is pushed downward beneath a less dense plate when plates converge
  7. 13. A Princeton University geology professor who discovered the process of seafloor spreading
  8. 14. Mineralized remains of organisms, showing how long-dead organisms lived and how their bodies were structured
  9. 15. A supercontinent that all continents were once part of
  10. 16. Boundary where two tectonic plates move away from each other
  11. 18. The solid layer with plasticity in the upper mantle that is located just below the lithosphere; lithospheric plates "float" and move on this layer
  12. 20. The cool, rigid, outermost layer of Earth that consists of the crust and the uppermost part of the mantle; broken into pieces or segments called "plates."
  13. 21. A German scientist who proposed that all of the continents were once part of a supercontinent
Down
  1. 1. __________ spreading: A phenomenon by which magma from Earth's mantle comes up at the mid-ocean ridge and creates new oceanic crust
  2. 2. A supercontinent in the northern hemisphere made of present day North America, Europe, and Asia
  3. 3. The theory that the crust is divided into large pieces called tectonic plates that slowly move on top of the mantle.
  4. 4. A plant-eating dinosaur with short legs and barrel-shaped body whose fossils were discovered in Africa, India, and Antarctica
  5. 5. A freshwater, crocodile-shaped reptile, approximately 1 meter long, whose fossils were discovered in Africa and South America
  6. 6. ___________ drift: The theory that continents were once connected but have drifted apart
  7. 9. Boundary where two tectonic plates move toward one another.
  8. 17. Seed ferns with tongue-shaped leaves found in Africa, India, South America, Antarctica, and Australia
  9. 19. A chain of underwater mountains formed from seafloor spreading