Earth Science (4) by: Emily Holt

Earth Science (4) by: Emily Holt
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  • I am Alfred Wegener. I am the scientist behind the Continental Drift theory.  Continental Drift is when the plate tectonics under the earth moved the continents that were once together (pangea) apart.
  • Folding = occurs when rock layers bend.
  • Transform Boundary is when two tectonic plates slide past each other horizontally. Also called shearing.
  • Strike-Slip Fault= occurs when opposing forces cause rock to break and move horizontally
  • Tension = stress that occurs when forces act to stretch an object.
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  • Continental Crust = The relatively thick part of the earth's crust.
  • Convergent Boundaries occur when two plates push into one another.
  • Subduction Zone is a region where oceanic plates sink into the asthenosphere 
  • Oceanic = One oceanic plate slides under the other
  • Density = The amount of compactness in an object
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  • Divergent Boundaries occur when two plates move away from one another.
  • Mid-Atlantic Ridge = a divergent tectonic plate located along the floor of the Atlantic Ocean
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  • Convection Current = a current in a fluid that results from convection
  • Sea Floor Spreading = The formation of new areas of oceanic crust
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  • Triangulation = a way to calculate the distance a earthquake traveled over territories or regions
  • p wave = primary wave s wave = secondary wave
  • Epicenter = The point on the earth's surface vertically above the focus of an earthquake
  • A Seismograph detects the force and duration of a earthquake
  • Richter Scale is a numerical scale that expresses the magnitude of an earthquake
  • The Ring of Fire is an area in the basin of the Pacific Ocean. Where a lot of volcanic eruptions occur.
  • Cinder Volcano = made from moderately explosive eruptions.
  • Composite Volcano = Formed by explosive eruptions.
  • Nonexplosive eruptions create lava flows. In explosive eruptions, clouds of hot debris and gas shoot out of the volcano.
  • Shield Volcano = built out of layers of lava from repeated nonexplosive eruptions.
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