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Across 4. A convergent plate margin where two plates collide. (Collision Zone) 5. An isolated submerged volcanic mountain standing more than 1000 m above the seafloor. (Seamount) 6. The new, growing edge of a plate. Coincedent with a midocean ridge. (Spreading Center) 7. A submerged platform of variable width that forms a fringe around a continent. (Continental Shelf) 9. The linear zone along which a plate of lithosphere sinks down into the asthenoshpere. (Subduction Zone) 10. Broad flat expanses of seafloor, 3 to 6 km deep. Young oceanic plate grows dense and subsides as it cools. Abyssal floors form after an oceanic plate has cooled enough for heat rising from the deep mantle to balance heat loss through the seafloor.(Abyssal Floor) 11. The ideal property of flotational balance among segments of the lithosphere. (Principle of Isostasy) 13. Convection of Earth's mantle, driven both by the thermal buoyance of hot rock rising from the depth and by sinking of cooler, denser lithosphere. (Mantle Convection) 16. Long, narrow, very deep, and arcuate basins in the seafloor. (Trenches) 18. The zone where plates meet as they move toward each other. (Convergent Margin) 19. Junction between three plate spreading edges. The angle between any two edges is approximately 120 degrees. (Plate Triple Junction) 20. The latitude of a place on the Earth with respect to the magnetic poles. (Magnetic Latitude) 22. A theory proposed during the early 1960's in which lateral movement of the oceanic crust away from midocean ridges was postulated. (Seafloor Spreading) 23. The tendency for young oceanic lithosphere to slide laterally down the slope of a midocean rige under the influence of gravity, thereby pushing the rest of the plate away from the ridge. (Ridge Push) 24. A pronounced slope beyond the seaward margin of the continental shelf. (Continental Slope)

Down 1. The slow, lateral movements of continents across Earth's surface. (Continental Drift) 2. A fracture in the lithosphere along which two plates slide past each other. (Transform Fault Margin) 3. A continental coastline that is coincident with a convergent plate boundary. (Active margin) 8. A fixed point on the Earth's surface defined by long-lived volcanism. (Hot Spot) 12. The rate of increase of temperature downward in Earth. (Geothermal Gradient) 14. A region of gently changing slope where the floor of the ocean basin meets the margin of a continent. (Continental Rise) 15. A continental margin in a plate interior. (Passive Margin) 17. A fracture in the lithosphere where two plates move apart. (Divergent Margin) 21. The tendency for sinking lithosphere at a convergent plate boundary to pull the rest of the plate laterally into the convergent zone. (Slab Pull)