Across
- 3. the hypothesis that the continents have slowly moved around the Earth over millions of years
- 9. the deepest parts of the ocean floor
- 10. a naturally occuring solid that can form by inorganic processes and has a crystal structure and definite chemical composition
- 11. rock that is formed from magma or lava cooling down
- 13. in this type of boundary, the plates are sliding past each other
- 15. rock that is formed from heat and pressure
- 16. in this type of boundary, the plates are moving away from each other
- 18. 2nd layer below the earth, made of mostly rocks and magma
- 19. this layer of the earth is made of spinning liquid metal
- 20. rock that is formed from smaller rocks pressed together
- 21. the Earth's crust is broken up into these large slabs of rock
Down
- 1. the process of ocean sea floor falling into the mantle is called this
- 2. an idea that can be tested
- 4. in this type of boundary, the plates are moving towards each other
- 5. these types of currents can be found in the mantle spreading heat
- 6. earthquakes make these types of waves
- 7. a crack in the Earth's crust, usually in the boundary between two plates
- 8. the outermost layer of the earth
- 10. rock that is heated until it is melted becomes this
- 12. long zipperlike chains of undersea mountains are called this
- 14. movement of the Earth's plates causes this
- 17. the innermost layer of the earth, made of solid metal