Across
- 2. primary driving force for movement of tectonic plates, heating and cooling of material in mantle
- 3. elevated area of the seafloor characterized by high heat flow & volcanism
- 8. individual pieces of Earth’s shell that interact to produce earthquakes, volcanoes, etc.
- 9. formed during continental-continental convergence; composed of deformed sedimentary and metamorphic rocks; ex. The Himalayas
- 11. Older, denser portions of oceanic lithosphere that descend into mantle at a rate equal to seafloor production
- 13. deep canyonlike structure along the crest of some ridge segments
- 14. Lithosphere stretches, promotes mantle upwelling, thins lithosphere and breaks brittle crystal rocks, broken fragments sink generating an elongated depression
- 15. theory that new oceanic crust is produced at the crests of mid-ocean ridges
- 16. a plate boundary in which two plates move apart
- 18. one descends beneath the other, initiating volcanic activity; produces volcanic island arcs
- 19. crust folds and deforms the accumulation of sediments and sedimentary rocks along the continental margin; produces mountain belts
- 20. a narrow, elongated depression of the seafloor
Down
- 1. the buoyant continental crust remains “floating” while the denser oceanic crust sinks into the mantle; forms continental volcanic arcs
- 4. a chain of volcanic islands generally located a few hundred km from a trench where there is active subduction of one oceanic plate beneath another
- 5. linear zone of irregular topography on the deep-ocean floor that follows transform faults and their inactive extensions
- 6. a plate boundary in which two plates slide past one another without creating or destroying lithosphere
- 7. the theory that there was once a supercontinent and over time it broke into smaller continents which drifted to their present positions
- 10. mountains formed in part by igneous activity associated w/ the subduction of oceanic lithosphere beneath a continent
- 12. supports Continental drift theory, ancient climates, coastlines, matching fossils, etc.
- 17. a plate boundary in which two plates move toward one another