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Across 2. Transfer of heat through the movement of a fluid material 4. System of undersea mountain ranges that wind around the earth 7. Deep valley in th ocean floor that forms along a subduction zone 10. Movement in a fluid caused by uneven heat 11. Material that makes up landmasses 15. Boundary formed by two lithospheric plates that are moving apart 16. Giant ocean surrounding Pangaea 17. Thin outer shell of the earth consisting of the crust and the ridge upper mantel 18. Material that makes up the ocean floor 19. Piece of land with a geologic history distinct from that of the surrounding land

Down 1. Undersea mountian range with a steep, narrow valley along its center 2. Border formed by the direct collision of two lithospheric plates 3. Theory that the lithosphere is made up of plates that float on the asthenosphere 5. Region where one lithosphere plate moves under another 6. Movement of the ocean floor away from either side of a mid-ocean ridge 8. Hypothesis stating that the continents once formed a single landmass 9. Single landmass thought to have been the origin of all continent 12. Zone of mantel beneath the lithosphere that consists of slowly flowing solid rock 13. Chain of volcanic islands formed along an ocean trench 14. Steep, narrow valley formed as lithospheric plates seperate