Plate Tectonics

Plate Tectonics

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  • Alfred Wegner was a scientist who came up with a theory called the continental drift.The large body of land our earth used to be called was Pangea. He figured out the earth is made up of 10 major plates making up land below and above the oceans. The plates move away from each other also known as divergent boundaries.
  • Transform boundaries happen when two plates slide past one another horizontally. The stress or tension that is happening at this boundary is known as as shearing or strike-slip faulting.
  • Convergent boundaries occur when two plates push into one another. The subduction zone is where the oceanic plate sinks into the asthenosphere. The oceanic plate slides under the continental crust. The reason that the oceanic crust goes under the continental because its more dense.
  • Divergent boundaries occur when two plates pull apart from each other.It creates new oceanic seafloor because as the plates pull apart the magma moves to the surface of the ocean floor and builds ridges for example the mid-atlantic ridge.
  • Earthquakes along faults due to sliding. S waves are the waves that travel through Earth also, they only travel through solids. P waves are the fastest wave and travel through solids,liquids, and gases. the epicenter is the point on the earths surface directly above an earthquakes starting point.  The Richter scale is commonly used to measure the earthquake magnitude. A seismograph is instruments located at or near the surface of the earth that record s waves. Triangulation is a way of determining something's location using the locations of other things.
  • There are two types of eruptions-nonexplosive and explosive. Nonexplosive eruptions create lava flows. Explosive eruptions clouds of hot debris and gas shoot out of the volcano. Shield volcanoes are built out of layers of lava from repeated nonexplosive eruptions. Cinder volcanoes are small cones made entire;y of pyroclastic material from moderatly explosive volcanoes. Composite volcanoes form by explosive eruptions followed by quieter outpourings of lava.The Ring of Fire is formed due to subduction zones of three main active tectonic plates namely the Eurasian, Pacific, and Australian plates..
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