Tectonic Plates

3. helps us identify the age of rocks
5. the US state that the river that carves the Grand Canyon is named after
8. Earth's interior
11. zone where one plate goes under the other
14. flat, elevated landform that rises sharply above the surrounding area on at least one side
15. lithosphere is a layer of rigid rock that consists of the crust and the upper part of Earth’s mantle
16. A _____ slope erodes faster
18. we used this to model erosion
19. When met with a continental plate, this plate sinks under
20. a boundary that forms trenches
23. an ancient oceanic plate that subducted under North America
24. relatively thick part of the earth that forms large landmasses

1. a supercontinent before Pangaea
2. the breaking down or dissolving of rocks and minerals
4. an accurate way to measure ocean depths
6. a geologic feature that can be created by a convergent boundary
7. one of the plates that is responsible for the Mariana Trench
9. maps out the sequence of events
10. a boundary that forms ridges
12. plates that are ______ sink under other plates
13. they used this to first "discover" the depth of the Mariana Trench
17. process where earthen materials are worn away and transported by natural forces such as wind or water
21. the mountains where the Colorado River starts
22. enormous, slowly-moving sections of Earth’s crust