Plate Tectonics Vocabulary Crossword
                                    
                                    
                                    
                                    
                                    
                                    
                                    
                                    
                                    
                                    
                                    
                                    
                                    
                                    
                                    
                                    
                                    
                                    
                                    
                                    
                                    
                                    
                                    
                                    
                                    
                                    
                                    
 
 
Down: 1) steep, narrow valley formed as lithospheric plates separate, pull apart2) lava and pyroclastic material built up on the Earth’s surface around a vent4) movement of the ocean floor away from either side of a mid-ocean ridge5) region where one lithospheric plate moves under another6) hypothesis stating that the continents once formed a single landmass, broke up, and drifted to their present locations8) scientist who studiesearthquakes and seismic waves9) single landmass thought to have been the origin of all continents10) largest layer inside Earth, lying directly above the outer core and that is made mostly of silicon, oxygen, magnesium, and iron16) boundary formed by two lithospheric plates that are moving apart17) remains or traces of a once living organism preserved by rock18) German scientist who proposed the continental drift hyppothesis20) the weather in some location averaged over some long period of time21) thin outer shell of the Earth consisting of the crust and the rigid upper mantle Across: 3) boundary formed where two lithospheric plates slide past each other7) theory that the lithosphere is made up of plates that float on the asthenosphere and that the plates possibly are moved by convection currents11) 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.12) the condition of being covered with glaciers or masses of ice; the result of glacial action13) zone of mantle beneath the lithosphere that consists of slowly flowing solid rock14) very dense, solid center od the Earth that is made of mostly iron with smaller amounts of oxygen, silicon, sulfur, or nickel15) the migration over the surface of the Earth of the magnetic poles of the Earth through geological time.19) border formed by the collision of two lithospheric plates22) an area that is subject to or experiences earthquakes or earth vibrations23) a long steep-sided depression in the ocean floor24) vibrations caused by breaking rocks along faults25) Earth's outermost layer, which varies in thickness from about 5km to 60km and is separated from the mantle by the Moho Discontinuity26) cycle of heating, rising, cooling, and sinking that is thought to be the force behind plate tectonics27) surfaces along which rocks break and move
 

 

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