Review#6 earthquakes & other crustal activity
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Review#6 earthquakes & other crustal activity

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EARTH SCI REVIEW

EARTH SCI REVIEW

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Review#6 earthquakes & other crustal activity Review#6 earthquakes & other crustal activity Presentation Transcript

  • L.O: DYNAMIC CRUST,EARTHQUAKES, EARTH’S INFERREDINTERIOR & PLATE TECTONICS.
  • The crust is the outer-most layer of thelithosphere.• Most of the crust is made of two elementsoxygen and silicon.• There is two kinds of crust: continental andoceanic.• Continental crust is felsic, made of granite,thicker and low density (2.7g/cm3)• Oceanic crust is mafic, made of basalt, thinner,high density (3.0 g/cm3)
  • The crust is the outer-most layer of thelithosphere.• page 1 of ESRT has info about crust’scomposition.• page 1 of ESRT has info about crust’scomposition.• Complete page 42-43 in your workbook.
  • The crust is dynamic, constantlychanging.
  • The Earth’s crust has many fault zones-cracks in its surface.
  • Most of Earth’s crustal activity happenaround the fault zones.
  • earthquakes, mountain-building andvolcanoes all happen around the faultzones.
  • The rock strata of EARTH’S crustcontinually changes
  • The rock strata of EARTH’S crust undergoestilting, folding, faulting, uplift andsubsidence
  • faulting
  • folding
  • On the regents I will sequence rocklayers
  • I must be able to tell which eventhappened when.
  • EARTHQUAKES
  • EARTHQUAKESIS A SUDDEN MOVEMENT OF EARTHALONG A FAULT OR BREAK IN THEEARTH.
  • SEISMIC (EARTHQUAKE) WAVES AREGENERATED WHEN AN EARTHQUAKEHAPPENS.
  • P-WAVES AND S-WAVES ARE GENERATEDWHEN EARTHQUAKES HAPPEN.
  • P-WAVES travel faster than S-WAVES.Thusly, P-WAVES always arrive first toan earthquake detection station.
  • The difference between the P-WAVESan S-WAVES arrival times is used todetermine the earthquake’s epicenter.
  • 12 minutes – 6 minutes= 6 minutes.
  • Three seismograms are used totriangulate the location of anearthquake’s epicenter.
  • Open your workbook to page 122.complete the questions.
  • The inferred properties of the Earth’sinterior.
  • The interior properties of Earth’sinterior are inferred from studying .• Seismic wave behavior• The composition of meteorites
  • P-waves can pass thru solids andliquids. S-waves solid only.
  • The outer core is inferred to be liquidbecause of the shadow zones, where no S-waves are detected.
  • COMPLETE PAGE 115-121
  • PLATETECTONICS:The theory of continental drift says that thecontinents have moved into their present
  • evidence of continental drift (crustalplate motion).• The continents look like a jigsaw puzzle.• Rock layers and fossil on different continentsmatch.• Sea floor spreading
  • The theory of plate tectonic explainsearthquakes, volcanoes, mountainranges and the cause of continentaldrift.
  • The Earth’s crust is made of hugeplates that move.Movement at the plates causeearthquakes, volcanoes, mountainsand continental drift.
  • The crustal plates can move in threeways: (three kinds of boundariesbetween plates)
  • Convergent plate boundary(subduction zone)
  • Subduction zone (convergentboundary)
  • Subduction zone (convergentboundary)
  • Two transform plate boundarys
  • Seafloor spreading: why thecontinents drift
  • At the mid-atlantic ridge, new crust is beingcreated. The new crust pushes away oldcrust.
  • As the old crust is pushed away, thecontinents are pushed too.
  • the oldest crust is at the continentalshelf, the youngest crust at the mid-atlanticridge..
  • Evidence of new seafloor formation is the alternatingpattern of reverse and normal polarity of mineralalignment in the seafloor crust.
  • Convection currents in the Earth’sasthenosphere power continetal drift (earthquakes, plate tectonics etc0
  • Complete page 65 of green workbook