Plate Tectonic

2. Ancient landmass made up of all the continents that began to break apart about 200 million years ago.
3. It is a layer at the top of the Earth's surface.
6. where new crust is generated as the plates pull away from each other.
8. A person who introduced a plate tectonic theory.
12. States that Earth's crust and upper mantle are broken into plates.
15. The weight of a subducting plate helps pull the trailing lithosphere into subduction zone.
16. Changes in Earth's magnetic field over geologic time.
17. a vent in the earth's crust through which lava, steam, ashes, etc., are expelled
19. It is the rigid, outermost shell of a rocky planet

1. Device used to map the ocean floor that detects small changes in magnetic fields.
4. where crust is neither produced nor destroyed as the plates slide horizontally past each other.
5. The weight of the uplifted ridge is thought to push an oceanic plate toward the trench formed at the subduction zone.
7. Hess's theory that new ocean crust is formed at mid-ocean ridges and destroyed at deep-sea trenches
9. Study of Earth's magnetic record using data gathered from iron-bearing minerals in rocks.
10. It is a layer under the crust.
11. a series of vibration induced in the Earth's cru
13. Wegener's hypothesis that Earth's continents were joined as a single land mass about 200 million years ago.
14. process by which one tectonic plate slips beneath another tectonic plate.
18. Line on a map that connects points of the same age.
20. It is hot regions of Earth's mantle where high-temperature plumes of mantle material rise toward the surface.