science 2-22-18

science 2-22-18
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  • Pangea is described how all of the separate pieces of land were joined to create one large landmass. Alfred Wegener's theory of Continental Drift was described  when all of the continents can drift apart, because they had done so in the past.
  • One Landmass (Pangea)
  • transform boundaries happen when two plates slide (also known as a strike slip.) this is known as the process of shearing. Tension of the plates sliding causes stress and creates faulting, which leads to earthquakes.
  • Convergent boundaries happen when two plates push together into each other. Subduction zone is where the oceanic plate sinks into the asthenosphere. The oceanic crust is  made up of basalt and averages from 5-8 km thick. The density of the oeanic crust is denser than the continental.
  • Divergent Boundaries:  Convection currents cause magma to move to the surface, leading to the separation of the plates. The Mid-Atlantic ridge is an example of a divergent boundary.
  • An earthquake is caused when two of the Earths' plates collide. The earthquake gets measured with an instrument called a seismograph, which gets ranked on the richter scale based on force and destruction. The earthquake is then located using things called triangulation (exact location on the earth) and the epicenter (where it hit on land, directly above the exact location inside of the earth. Objects on land are effected by waves called P and S waves. P waves jit first, then S.
  • A volcano is an explosive mountain, containing ash and magma. Some volcanoes can be non-explosive, but most are explosive. Most active volcanoes  are found in the ring of fire, an area in the basin of the pacific ocean. There are 3 different types of volcanoes. Shield (flat) , Cinder (Tall), and Composite (tall & wide.)
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