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WHSESC17

Tanner Bullard

Chapter 17 Vocabulary 1-15

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Across
1.Wegener's hypothesis that Earth's contients were joined as a single landmass, called Pangaea, that broke apart about 200 million years ago and slowly moved to their present positions.
4.Line on a map that connects points of the same age.
5.Place where two of Earth's tectonic plates are moving toward each other.
9.Ancient landmass made up of all the continents that began to break apart about 200 million years ago.
10.Long, narrow depression that forms when continental crust begins to separate at a divergent boundary.
11.Process by which one tectonic plate slips beneath another tectonic plate.
12.Tectonic process associated with convection currents in Earth's mantle that occurs when the weight of an elevated ridge pushes an oceanic plate toward a subduction zone.
13.Place where two tectonic plates slide horizontally past each another that is characterized by long faults and shallow earthquakes.
14.Tectonic process associated with convectioin currents in Earth's mantle that occurs as the weight of the subducting plate pulls that trailing lithosphere into a subduction zone.
15.Changes in Earth's magnetic field over geologic time, recorded in ocean-floor rocks and continental basalt flows.
Down
2.States that Earth's crust and upper mantle are broken into plates, wich are huge rock slabs that move in different directions and at different rates over Earth's surface.
3.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 the time of their formation.
6.Place Where two of Earth's tectonic plates are moving apart.
7.Hess's theory that new ocean crust is formed at mid-ocean ridges and destroyed at deep-sea trenches
8.Device used to map the ocean floor that detects small changes in magnetic fields.

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