UMass Amherst GEO-SCI 103 - Plate Tectonics: shifting continents and Seafloor Spreading (5 pages)

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Plate Tectonics: shifting continents and Seafloor Spreading



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Plate Tectonics: shifting continents and Seafloor Spreading

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Through analysis of the different layers of the Earth, we can determine the basic concepts of plate tectonics along with the different collision behaviors associated with each. In addition, we see how these occurrences impact or result in volcanic and earthquake activity.


Lecture number:
5
Pages:
5
Type:
Lecture Note
School:
University of Massachusetts Amherst
Course:
Geo-Sci 103 - Intro Oceanography GenEd: PS
Edition:
1

Unformatted text preview:

GEO SCI 103 Lecture 5 Outline of Last Lecture I Earthquakes and Seismic Waves Earth Structures Revealed II Continents Ocean Basins and Equilibrium III Features of the Ocean Floor Outline of Current Lecture Plate Tectonics shifting continents seafloor spreading 9 16 14 I Basic Concepts of Plate Tectonics A Behavior of Earth s Layers B Tectonic Plates C Plate Tectonics II Plate Boundaries Earthquakes and Volcanism A Earthquakes and the 3 types of Plate Boundaries B Volcanism III Divergent Plate Boundaries IV Convergent Plate Boundaries A Definition B Types of Collisions V Transform Plate Boundaries A Strike Slip Boundaries B San Andreas Fault VI Mantle Plumes and Hot Spots A Mid Atlantic Ridge B Volcanic Island Chains Current Lecture I Basic Concepts of Plate Tectonics A Behavior of Earth s Layers a Region of the upper mantle underlying the lithosphere behaves like a ductile substance and is capable of flowing like hot plastic though it is not a liquid b The low strength region of the upper mantle is the asthenosphere also known as the low velocity zone where seismic waves passing through slow down These notes represent a detailed interpretation of the professor s lecture GradeBuddy is best used as a supplement to your own notes not as a substitute c The Earth has been slowly losing heat by conduction transfer of heat from one atom to another and convection differential heat loss that causes movement of mass d Upwellings are sites at the surface where old continents are rifted apart oceanic crust is produced and new ocean basins are formed e Downwellings sites where old oceanic crust is recycled back into the mantle volcanic islands volcanic mountain ranges are formed and where continents collide B Tectonic Plates a Because of these deep seated stresses that occur with upwellings and downwellings the outer shell of the Earth is broken into numerous rigid lithospheric plates tectonic plates which move slowly around the globe at rates of 2 to 20 cm year C Plate



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