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Across 1. huge pieces of crust and rigid upper mantle that fit together at their edges to cover the earth's surface (2 words) 10. study of earth's magnetic field 14. when two tectonic plates are moving apart (2 words) 15. an imaginary line on the map that shows points that have the same age 16. the greek word for earth

Down 2. when tectonic plates are moving toward each other (2 words) 3. the movement of tectonic plates (2 words) 4. the stretched crust forms a long narrow depression (2 words) 5. when new ocean crust is formed at ocean ridges and destroyed at deep sea trenches (2 words) 6. when two plates slide horizontally past eachother (2 words) 7. detects small changes in magnetic fields 8. the weight of the uplifted ridge is thought to push the oceanic plate toward the trench formed at the subduction zone (2 words) 9. when the flow in the outer core changes (2 words) 11. the process when two plates collide, the denser plate eventually decends below the other 12. volcanoes, mountains, and deep sea trenches form from the boundaries between (2 words) 13. idea that the wolrd had been one been joined