Earth Science Crossword Puzzle

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Across
  1. 3. A central valley formed at the summit of the oceanic ridges as the molten materials continuously flow out from the ridges. The molten materials push the seafloor away from the ridges and towards the trenches.
  2. 5. Are inclined fractures where the blocks have mostly shifted vertically.
  3. 9. Formed when two tectonic plates converge, the heavier plate is forced downward, creating a subduction zone.
  4. 10. Occurs when two plates move toward each other.
  5. 13. The circulation of material caused by the differences in density.
  6. 16. A fault rock which is cohesive and characterized by a well-developed planar fabric resulting from tectonic reduction of grain size.
  7. 17. A fracture or zone of fractures between two blocks of rock. Faults allow the blocks to move relative to each other.
  8. 18. occurs when two plates move away.
  9. 19. A fracture separating plates from one another. One of the boundaries known is divergent boundary.
  10. 20. Newly-formed plates at oceanic ridges are warm, and so have a higher elevation at the oceanic ridge than the colder, more dense plate material farther away from the divergent boundary.
Down
  1. 1. Older, colder plates sink at subduction zones because as they cool,they become denser than the underlying mantle – so the sinking plate pulls the rest of the plate along behind it.
  2. 2. Folds are chaotic, random and disconnected. Typical of sedimentary slump folding, migmatites and decollement detachment
  3. 4. Linear, strata normally dip away from axial center, oldest strata in center.
  4. 6. Caused by forces that are exerted on the edges or interior of a material.
  5. 7. Are regions that are below sea level. About 70% of these areas hold the planet’s water.
  6. 8. An American geophysicist who proposed seafloor spreading theory.
  7. 11. Angular fold with straight limbs and small hinges.
  8. 12. A fault on which the two blocks slide past one another.
  9. 14. measurements of ocean depths and the charting of the shape or topography of the ocean floor.
  10. 15. A transform boundary connects two diverging boundaries, creating a fault line.