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20 True/False questions

  1. Geologically, ________ are actually submerged parts of the continents.continental rise

          

  2. Water depths and seafloor topography are now routinely determined by ________.sound pulse to travel from a ship to the seafloor and back

          

  3. East Africa, the Rhine Valley, and the Baikal in Siberia are all examples of ________.continental rifts

          

  4. ________ develop where oceanic lithosphere bends downward and sinks into the mantle.Deep ocean trenches

          

  5. Which one of the following would typically have the widest continental shelf?deep-sea fan at the base of a continental slope

          

  6. The gently sloping submerged surface extending from the shoreline toward the deep ocean is termed the ________.continental shelf

          

  7. The ________ lies at the base of the continental slope.The top of the continental slope

          

  8. Seamounts ________.all of these

          

  9. Plate subduction occurs because the ________, not the oceanic crust, is denser than the underlying asthenosphere.70%

          

  10. Basaltic rocks of the oceanic crust are altered by heated seawater moving through fractures in a process known as ________.hydrothermal metamorphism

          

  11. Oceanic ridges are elevated compared to the surrounding ocean floor because ________.newly formed lithosphere is hotter and therefore less dense than the surrounding rocks

          

  12. An echo sounder operates by measuring the time required for a ________.sound pulse to travel from a ship to the seafloor and back

          

  13. Spreading rates of ________ are common along the Mid-Atlantic and the Mid-Indian ridges.1 to 5 centimeters per year

          

  14. Seafloor spreading occurs along relatively narrow areas at the crests of oceanic ridges called ________.continental shelves

          

  15. "Black smokers" are associated with ________.are volcanoes that form on the ocean floor

          

  16. Where in the oceans are biological communities thriving without sunlight?The top of the continental slope

          

  17. Which one of the following would most likely be covered with thick turbidite layers?A tectonically passive, trailing continental margin

          

  18. ________ is the oceanward edge of a continental shelf.continental rise

          

  19. Which one of the following statements concerning submarine canyons is not true?They were cut by streams and rivers during the Pleistocene when sea level had dropped to the base of the continental slope.

          

  20. Oceans cover approximately ________ of Earth's surface area.are volcanoes that form on the ocean floor