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Across 2. force that slowly wears away mountains and other features on the surface of the Earth 5. plate boundary where two plates move past each other in opposite directions 6. force that builds up mountains and landmasses on Earth's surface 8. process by which molten material adds new oceanic crust to the ocean floor 10. theory that the pieces of Earth's lithosphere are in constant motion, driven by convection currents in the mantle 11. plate boundary where two plates move away from each other 12. movement of energy from a warmer object to a cooler object 13. rigid layer made up of the uppermost parth of the mantle and the crust 14. process by which oceanic crust sinks beneath a deep-ocean trench and back into the mantle at a convergent plate boundary 15. deep valley that forms where two plates move apart

Down 1. the undersea mountain chain where new ocean floor is produced; a divergent plate boundary 3. plate boundary where two plates move toward each other 4. transfer of heat by movements of a heated fluid 7. name of the single landmass that broke apart 200 million years ago and gave rise to today's continents 9. soft layer of the mantle on which the lithosphere floats