Exam 2 Tectonics

5. Rocks upwell, enter lower pressure zone and expand rapidly, creates major force of plate tectonics
7. hinge of fold is oriented downward with limbs that rise up away from the hinge
8. weakest of 3 forces of plate tectonics, between crust and mantle
11. faults that have vertical motion – can be reverse or normal
13. Bending, squishing, or stretching deformation occurs slowly over time.
15. coarsening upward pattern of sediments as sea level drops
16. lateral or transform faults form when fault movement is horizontal as plates slide past each other
17. unseen force applied to rocks that can build up and eventually produce strain
18. zone of earthquakes that form along a subducting tectonic plate

1. Strain in which an object suddenly breaks, fractures, or otherwise fails
2. result of an applied force, either ductile, brittle, or elastic deformation
3. Tectonic boundary where two plates move toward each other, O-O, O-C, or C-C.
4. Driving force of tectonics exerted by old, dense, cold crust sinking into the mantle.
6. downfolded circular structure formed by intersecting synclines
9. hinge of a fold pushes upward with limbs that dip away and down from it
10. continental drift hypothesis using many lines of evidence but lacked mechanism.
11. uplifted circular structure forms by intersecting anticlines
12. parent rock material, before metamorphism
13. where two plates move apart from each other
14. fining upward pattern of sediments as sea level rises