Geosphere Review

2. in this type of boundary, the plates are moving towards each other
3. the hypothesis that the continents have slowly moved around the Earth over millions of years
5. in this type of boundary, the plates are moving away from each other
6. the innermost layer of the earth, made of solid metal
8. the process of ocean sea floor falling into the mantle is called this
9. rock that is heated until it is melted becomes this
15. the Earth's crust is broken up into these large slabs of rock
17. movement of the Earth's plates causes this
19. 2nd layer below the earth, made of mostly rocks and magma
20. in this type of boundary, the plates are sliding past each other
21. rock that is formed from smaller rocks pressed together
22. an idea that can be tested

1. long zipperlike chains of undersea mountains are called this
4. rock that is formed from magma or lava cooling down
7. the deepest parts of the ocean floor
10. this layer of the earth is made of spinning liquid metal
11. these types of currents can be found in the mantle spreading heat
12. rock that is formed from heat and pressure
13. a crack in the Earth's crust, usually in the boundary between two plates
14. the outermost layer of the earth
16. earthquakes make these types of waves
18. a naturally occuring solid that can form by inorganic processes and has a crystal structure and definite chemical composition