Across
- 3. spreading the hypothesis that new ocean crust is formed at mid-ocean ridges and destroyed at deep-sea trenches; occurs when in a continuous cycle of magma intrusion and spreading
- 4. huge pieces of Earth’s crust that cover its surface and fit together at their edges
- 8. Ancient landmass made up of all the continents that began to break apart 200 mya.
- 9. fracture or system of fractures in Earth’s crust that occur when stress is applied too quickly or stress is to great; can form as a result of horizontal compression, horizontal shear, or horizontal tension.
- 10. the change in elevation of the crust
- 11. device used to map the ocean floor that detects small changes in magnetic fields.
- 13. place where two tectonic plates slide horizontally past each another; is characterized by long faults and shallow earthquakes.
- 14. places where two tectonic plates are moving apart: is associated with volcanism, earthquakes, and high heat flow, and is found primarily on the seafloor
Down
- 1. Wegner’s hypothesis that Earth’s Continents were joined as a single landmass, called Pangaea, that broke apart about 200 mya and slowly moved to their present positions.
- 2. Boundary place where two tectonic plates are moving toward each other; associated with trenches, island arcs, and folded mountains.
- 5. process by which one tectonic plate slips beneath another tectonic plate
- 6. study of Earth’s magnetic record using data gathered from iron-bearing minerals in rocks that have recorded the orientation of Earth’s magnetic field at their time of formation.
- 7. cycle of process that form all mountain ranges, resulting in board linear regions of deformation that you know as mountain rangers but in geology are called orogenic belts.
- 12. describes all the process associated with the discharge of magma, hot water, and steam