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Plate Tectonics Vocabulary Crossword
Down
:
1) movement of the ocean floor away from either side of a mid-ocean ridge
2) single landmass thought to have been the origin of all continents
3) Earth's outermost layer, which varies in thickness from about 5km to 60km and is separated from the mantle by the Moho Discontinuity
5) remains or traces of a once living organism preserved by rock
6) vibrations caused by breaking rocks along faults
7) steep, narrow valley formed as lithospheric plates separate, pull apart
8) border formed by the collision of two lithospheric plates
9) cycle of heating, rising, cooling, and sinking that is thought to be the force behind plate tectonics
13) boundary formed by two lithospheric plates that are moving apart
14) theory that the lithosphere is made up of plates that float on the asthenosphere and that the plates possibly are moved by convection currents
15) the condition of being covered with glaciers or masses of ice; the result of glacial action
17) the weather in some location averaged over some long period of time
21) boundary formed where two lithospheric plates slide past each other
22) largest layer inside Earth, lying directly above the outer core and that is made mostly of silicon, oxygen, magnesium, and iron
24) very dense, solid center od the Earth that is made of mostly iron with smaller amounts of oxygen, silicon, sulfur, or nickel
Across
:
2) the migration over the surface of the Earth of the magnetic poles of the Earth through geological time.
4) German scientist who proposed the continental drift hyppothesis
10) scientist who studiesearthquakes and seismic waves
11) a long steep-sided depression in the ocean floor
12) surfaces along which rocks break and move
16) region where one lithospheric plate moves under another
18) Fluctuations, or anomalies in the intensity of the magnetic field, occur at the boundaries between normally magnetized sea floor and sea floor magnetized in the reversed direction.
19) hypothesis stating that the continents once formed a single landmass, broke up, and drifted to their present locations
20) thin outer shell of the Earth consisting of the crust and the rigid upper mantle
23) an area that is subject to or experiences earthquakes or earth vibrations
25) zone of mantle beneath the lithosphere that consists of slowly flowing solid rock
26) lava and pyroclastic material built up on the Earth’s surface around a vent
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