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20 Matching questions

  1. Seafloor spreading occurs along relatively narrow areas at the crests of oceanic ridges called ________.
  2. The gently sloping submerged surface extending from the shoreline toward the deep ocean is termed the ________.
  3. Seamounts ________.
  4. An echo sounder operates by measuring the time required for a ________.
  5. ________ is the oceanward edge of a continental shelf.
  6. ________ develop where oceanic lithosphere bends downward and sinks into the mantle.
  7. Basaltic rocks of the oceanic crust are altered by heated seawater moving through fractures in a process known as ________.
  8. Spreading rates of ________ are common along the Mid-Atlantic and the Mid-Indian ridges.
  9. "Black smokers" are associated with ________.
  10. Where in the oceans are biological communities thriving without sunlight?
  11. Geologically, ________ are actually submerged parts of the continents.
  12. Oceans cover approximately ________ of Earth's surface area.
  13. East Africa, the Rhine Valley, and the Baikal in Siberia are all examples of ________.
  14. Oceanic ridges are elevated compared to the surrounding ocean floor because ________.
  15. Plate subduction occurs because the ________, not the oceanic crust, is denser than the underlying asthenosphere.
  16. Which one of the following would typically have the widest continental shelf?
  17. Which one of the following would most likely be covered with thick turbidite layers?
  18. Which one of the following statements concerning submarine canyons is not true?
  19. Water depths and seafloor topography are now routinely determined by ________.
  20. The ________ lies at the base of the continental slope.
  1. a continental rise
  2. b 1 to 5 centimeters per year
  3. c are volcanoes that form on the ocean floor
  4. d all of these
  5. e sound pulse to travel from a ship to the seafloor and back
  6. f 70%
  7. g newly formed lithosphere is hotter and therefore less dense than the surrounding rocks
  8. h continental shelf
  9. i The top of the continental slope
  10. j A tectonically passive, trailing continental margin
  11. k deep-sea fan at the base of a continental slope
  12. l ship-mounted echo sounders
  13. m rift zones
  14. n continental rifts
  15. o lithospheric mantle
  16. p They were cut by streams and rivers during the Pleistocene when sea level had dropped to the base of the continental slope.
  17. q Deep ocean trenches
  18. r around seafloor hot spring vents
  19. s continental shelves
  20. t hydrothermal metamorphism