Ocean

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Across
  1. 3. pillow lava that has solidified as rounded masses, characteristic of eruption under wate
  2. 5. plates tectonic plate. noun. the two sub-layers of the earth's crust (lithosphere) that move, float, and sometimes fracture and whose interaction causes continental drift, earthquakes, volcanoes, mountains, and oceanic trenches. Dictionary.com's 21st Century Lexicon.
  3. 8. ridge forms long chains of mountains.
  4. 10. crust the relatively thin part of the earth's crust that underlies the ocean basins. It is geologically young compared with the continental crust and consists of basaltic rock overlain by sediments.
  5. 13. Drift Gradual movement of the continents across the earth's surface through geological time.
  6. 14. Valley a large elongated depression with steep walls formed by the downward displacement of a block of the earth's surface between nearly parallel faults or fault systems.
  7. 15. coming closer together
  8. 16. make a thorough or dramatic change
Down
  1. 1. Floor spreading the formation of new areas of oceanic crust, which occurs through the upwelling of magma at midocean ridges and its subsequent outward movement on either side.
  2. 2. Breaks in Earth’s crust where rocks have slipped past each other
  3. 4. tectonics States that Earth’s plate are in slow, constant motion, driven by convection currents in the mantle.
  4. 6. Sideways and downward movement of the edge of a plate of the earth's crust into the mantle beneath another plate.
  5. 7. a mountain or hill, typically conical, having a crater or vent through which lava, rock fragments, hot vapor, and gas are being or have been erupted from the earth's crust.
  6. 8. a large natural elevation of the earth's surface rising abruptly from the surrounding level; a large steep hill.
  7. 9. tending to develop different or be different
  8. 11. trench any long, narrow, steep-sided depression in the ocean bottom in which occur the maximum oceanic depths, approximately 7,300 to more than 11,000 metres (24,000 to 36,000 feet). They typically form in locations where one tectonic plate subducts under another.
  9. 12. hypothetical super continent that included all current land masses, believed to have been in existence before the continents broke apart during the Triassic and Jurassic Periods.