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Across 4. 260 millin years ago, all the continents were joined together in a supercontinent ______ 5. A scientific _____ is a well-tested concept that explains a wide range of observations. 6. A _______ valley is a deep valley on land that forms along a divergent boundary. 11. Explodes lava 12. This happens when 2 plates carrying ocean crust meet at a trench and the less dense dives under the other plate and returns to the mantle 14. When 2 plates carrying continental crust collide they form a _____ 16. The rate at which plates move at per year. 17. When 2 plates slip past each other, it's a _____ boundary 19. The longest chain of mountains in the world. 20. When 2 plates carrying oceanic crust collide, it forms a _____

Down 1. Process that continually adds new material to the ocean floor. 2. The lithosphere is broken into separate sections called ______ 3. When one plate is forced down, it is a mid _____ ridge. 7. The geological theory that states that pieces of the earth's crust are in constant motion. 8. When 2 plates move away from each other, it's a ____boundary 9. The movement of energy from a warmer object to a cooler object. 10. Breaks in the earth's crust where rocks have slipped past each other are called ________ 13. When 2 plates come together, it's a ______boundary 15. The ocean is ________ where magma comes out. 18. One of the materials that makes new rock.