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Stack #132669

Continental Drift the hypotesis that continents have moved slowlyto their current locations
Pangea the large landmass that consisted of all the continents connected
Seafloor Spreading 1) hot less dense material below Earth's crust rises upward to the surface at the mid-ocean ridges 2) then it flows sideways carrying the seafloor away from the ridge 3) as the seafloor spreads apart magma moves up and flows from the cracks cools=seafloor
Plate Tectonics Earth's crust are broken into sections called plates which move on a plasticlike layer of the mantle
Plate sections of Earth's crust
Lithosphere plates and upper mantle form the lithosphere
Asthenosphere plasticlike layer below the lithosphere
Convection Current thought to be the force behind plate tectonics
Earthquakes caused by strike-slip faults
Primary Waves 2x faster than secondary waves
Secondary Waves 2x slower than primary waves
Surface Waves the waves we feel during an earthquake
Epicenter directly above the focus; at the surface
Seismograph measures the strength of the earthquake
Volcano an opening in Earht that erupst gases, ash, and lava
Vent the opening that magma flows out of
Crater the steep-walled depression around a volcano's vent is the crater
Hot Spot some areas at the boundary between Earht's mantle and core are unusually hot
Sheild Volcano quiet eruptions of basaltic lava spread out in flat layers
Cinder Cone Volcano when tephra falls to the ground, it forms a steep-sided, loosely packed cinder cone volcano
Composite Volcano the eruption can be explosive then, can switch to a quieter period, erupting lava over the top of the tephra layer
Tephra bits of rock or solidified lava dropped from the air are called tephra
Created by: Abigail Garrett