List 24

3. / left alone, not bothered
4. / the process of one plate going under another
5. / loose materials such as rock fragments, mineral grains, and bits of shell that have moved by wind, water, ice , or gravity
8. / rock formed when exposed to extreme heat and pressure, rock that has changed form
11. of superposition / the geologic principle that states that in horizontal layers of sedimentary rock, each layer is older that the one above it
12. boundary / boundary between two colliding plates
13. boundary / a plate boundary where two plates move away from each other
14. / scientists who study Earth and the process that have shaped Earth over time
15. boundary / a plate boundary where two plates move past each other in opposite directions
17. / the preserved trace, imprints, or remains of a plant or animal
18. cores / a cylinder that contains ice that has trapped atmospheric gases from years before

1. / rock formed from cooled magma or lava
2. / the solid part the earth consisting of the crust and the mantle
4. rock / rock formed when layer of sediments harden over million of years. Forms layers
6. tectonics / the theory that explains how large pieces of the lithosphere, called plates move and change shape
7. / a break in the earth's crust
9. drift theory / theory states that the continents have not always been in their present locations buy have "drifted" there over million of years
10. floor spreading / the process by which molten material adds new oceanic crust
16. plates / lithospheric plates below the ocean