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45 Matching questions

  1. magnetic reversal
  2. relative plate velocity
  3. ridge-push force
  4. active continental margin
  5. volcanic arc
  6. fracture zone
  7. hot-spot track
  8. slab-pull force
  9. transform plate boundary
  10. paleopole
  11. mantle plume
  12. asthenosphere
  13. global positioning system (GPS)
  14. magnetic declination
  15. lithosphere plate
  16. apparent polar-wander path
  17. magnetic dipole
  18. plate
  19. absolute plate velocity
  20. collision
  21. hot spot
  22. continental drift hypothesis
  23. magnetic inclination
  24. Pangaea
  25. trench
  26. triple junction
  27. subduction
  28. Wadati-Benioff zone
  29. mid-ocean ridge
  30. abyssal plain
  31. convergent plate boundary
  32. magnetic-reversal chronology
  33. continental rift
  34. paleomagnetism
  35. marine magnetic anomaly
  36. rifting
  37. plate boundary
  38. lithosphere
  39. sea-floor spreading
  40. seamount
  41. magnetic pole
  42. black smoker
  43. divergent plate boundary
  44. magnetic anomaly
  45. passive margin basin
  1. a A boundary at which two plates move toward each other so that one plate sinks (subducts) beneath the other; only oceanic lithosphere can subduct.
  2. b The process by which one oceanic plate bends and sinks down into the asthenosphere beneath another plate.
  3. c The force that downgoing plates (or slabs) apply to oceanic lithosphere at a convergent margin.
  4. d The relatively rigid, nonflowable, outer 100- to 150-km-thick layer of the Earth; constituting the crust and the top part of the mantle.
  5. e One of about twenty distinct pieces of the relatively rigid lithosphere.
  6. f The border between two adjacent lithosphere plates.
  7. g A chain of now-dead volcanoes transported off the hot spot by the movement of a lithosphere plate.
  8. h An unusually strong or unusually weak magnetic field, as measured over the sea floor; in map view, they look like stripes that are parallel to the mid-ocean ridge.
  9. i The north or south ends of a magnet; field lines point straight down at the pole.
  10. j The movement of a plate relative to a fixed point in the mantle.
  11. k A 2-km-high submarine mountain belt that forms along a divergent oceanic plate boundary.
  12. l A curving chain of active volcanoes formed adjacent to a convergent plate boundary.
  13. m The layer of the mantle that lies between 100-150 km and 350 km deep; the asthenosphere is relatively soft and can flow when acted on by force.
  14. n A sloping band of seismicity defined by intermediate- and deep-focus earthquakes that occur in the downgoing slab of a convergent plate boundary.
  15. o The process of two buoyant pieces of lithosphere converging and squashing together.
  16. p The difference between the expected strength of the Earth's magnetic field at a certain location and the actual measured strength of the field at that location.
  17. q The angle between a magnetic needle free to pivot on a horizontal axis and a horizontal plane parallel to the Earth's surface.
  18. r A point where three lithosphere plate boundaries intersect.
  19. s The force that drives plates away from a mid-ocean ridge; it is caused by the fact that the ridge is elevated relative to the regions of oceanic plate away from the ridge.
  20. t The idea that continents have moved and are still moving slowly across the Earth's surface.
  21. u A boundary at which one lithosphere plate slips laterally past another.
  22. v A continental margin that coincides with a plate boundary.
  23. w A portion of the outer, relatively rigid layer of the Earth; most seismic activity happens at the boundaries of plates, while the interior of a plate is relatively stable.
  24. x The movement of one lithosphere plate with respect to another.
  25. y The change of the Earth's magnetic polarity; when a reversal occurs, the field flips from normal to reversed polarity, or vice versa.
  26. z A narrow band of vertical fractures in the ocean floor; fracture zones lie roughly at right angles to a mid-ocean ridge, and the actively slipping part of a fracture zone is a transform fault.
  27. aa A boundary at which two lithosphere plates move apart from each other; they are marked by mid-ocean ridges.
  28. ab The history of magnetic reversals through geologic time.
  29. ac A broad, relatively fl at region of the ocean that lies at least 4.5 km below sea level.
  30. ad A column of very hot rock rising up through the mantle.
  31. ae A magnetic entity that has a north and south end.
  32. af The angle between the direction a compass needle points at a given location and the direction of true north.
  33. ag A deep elongate trough bordering a volcanic arc; a trench defines the trace of a convergent plate boundary.
  34. ah A path on the globe along which a magnetic pole appears to have wandered over time; in fact, the continents drift, while the magnetic pole stays fairly fixed.
  35. ai A satellite system people can use to measure rates of movement of the Earth's crust relative to one another, or simply to locate their position on the Earth's surface.
  36. aj The record of ancient magnetism preserved in rock.
  37. ak A location at the base of the lithosphere, at the top of a mantle plume, where temperatures can cause melting.
  38. al The process by which continental lithosphere stretches and breaks apart; rifting produces normal faults and, commonly, volcanism.
  39. am A linear belt along which continental lithosphere stretches and pulls apart.
  40. an The cloud of suspended minerals formed where hot water spews out of a vent along a mid-ocean ridge; the dissolved sulfide components of the hot water instantly precipitate when the water mixes with seawater and cools.
  41. ao A thick accumulation of sediment along a tectonically inactive coast, formed over crust that stretched and thinned when the margin first began.
  42. ap An isolated submarine mountain.
  43. aq A supercontinent that assembled at the end of the Paleozoic Era.
  44. ar The gradual widening of an ocean basin as new oceanic crust forms at a mid-ocean ridge axis and then moves away from the axis.
  45. as The supposed position of the Earth's magnetic pole in the past, with respect to a particular continent.