Plate Tectonics Vocabulary Crossword
                                    
                                    
                                    
                                    
                                    
                                    
                                    
                                    
                                    
                                    
                                    
                                    
                                    
                                    
                                    
                                    
                                    
                                    
                                    
                                    
                                    
                                    
                                    
                                    
                                    
                                    
                                    
 
 
Down: 1) movement of the ocean floor away from either side of a mid-ocean ridge2) single landmass thought to have been the origin of all continents3) Earth's outermost layer, which varies in thickness from about 5km to 60km and is separated from the mantle by the Moho Discontinuity5) remains or traces of a once living organism preserved by rock6) vibrations caused by breaking rocks along faults7) steep, narrow valley formed as lithospheric plates separate, pull apart8) border formed by the collision of two lithospheric plates9) cycle of heating, rising, cooling, and sinking that is thought to be the force behind plate tectonics13) boundary formed by two lithospheric plates that are moving apart14) theory that the lithosphere is made up of plates that float on the asthenosphere and that the plates possibly are moved by convection currents15) the condition of being covered with glaciers or masses of ice; the result of glacial action17) the weather in some location averaged over some long period of time21) boundary formed where two lithospheric plates slide past each other22) largest layer inside Earth, lying directly above the outer core and that is made mostly of silicon, oxygen, magnesium, and iron24) 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 hyppothesis10) scientist who studiesearthquakes and seismic waves11) a long steep-sided depression in the ocean floor12) surfaces along which rocks break and move16) region where one lithospheric plate moves under another18) 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 locations20) thin outer shell of the Earth consisting of the crust and the rigid upper mantle23) an area that is subject to or experiences earthquakes or earth vibrations25) zone of mantle beneath the lithosphere that consists of slowly flowing solid rock26) lava and pyroclastic material built up on the Earth’s surface around a vent
 

 

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