Unit 4 Study Guide

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Across
  1. 2. compared to ocean crust near deep-sea trenchs, crust near ocean ridges is
  2. 6. approximately how much of earths surface is above sea level
  3. 9. features found at divergent boundaries include
  4. 10. which volcanoes are the most explosive
  5. 11. what is ocean crust made of
  6. 12. where do most volcanoes form
  7. 13. volcanoes that form far from plate boundaries are associated with
  8. 14. may early mapmakers thought earth's continents had moved based on
  9. 15. which boundary is crust neither destroyed nor fomed along
  10. 17. what difference in travel times between P- and S- waves be used to determine
Down
  1. 1. subduction results in the formation of
  2. 3. each cycle of spreading and intrusion of magma during seafloor spreading results in
  3. 4. continental-continental plate collisions produce
  4. 5. whats forms when plates move apart
  5. 7. the driving force of tectonic plates are realted to convection currents in earth's
  6. 8. what forms when the top or side of a volcano collapses into the magma chamber
  7. 16. the magnetic pattern of ocean-floor rocks on one side of an ocean ridges is