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    Plate Tectonics Ws

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    Mariana Lopez
    There are three types of plate boundaries where the Earth's tectonic plates meet and interact: divergent boundaries where plates spread apart and new crust is formed, convergent boundaries where plates collide and one plate subducts under the other, and transform boundaries where plates slide past each other. Most volcanic and earthquake activity occurs at plate boundaries as the vast plates shift and grind against each other. Over time, the recycling of ocean crust through subduction means new crust is continually generated at mid-ocean ridges and old crust is destroyed and melted back into the mantle.

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    Plate Tectonics Ws

    Uploaded by

    Mariana Lopez
    158 views2 pages
    There are three types of plate boundaries where the Earth's tectonic plates meet and interact: divergent boundaries where plates spread apart and new crust is formed, convergent boundaries where plates collide and one plate subducts under the other, and transform boundaries where plates slide past each other. Most volcanic and earthquake activity occurs at plate boundaries as the vast plates shift and grind against each other. Over time, the recycling of ocean crust through subduction means new crust is continually generated at mid-ocean ridges and old crust is destroyed and melted back into the mantle.

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    There are three types of plate boundaries where the Earth's tectonic plates meet and interact: divergent boundaries where plates spread apart and new crust is formed, convergent boundaries where plates collide and one plate subducts under the other, and transform boundaries where plates slide past each other. Most volcanic and earthquake activity occurs at plate boundaries as the vast plates shift and grind against each other. Over time, the recycling of ocean crust through subduction means new crust is continually generated at mid-ocean ridges and old crust is destroyed and melted back into the mantle.

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    © All Rights Reserved
    Download as PDF, TXT or read online from Scribd
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    158 views2 pages

    Plate Tectonics Ws

    Uploaded by

    Mariana Lopez
    There are three types of plate boundaries where the Earth's tectonic plates meet and interact: divergent boundaries where plates spread apart and new crust is formed, convergent boundaries where plates collide and one plate subducts under the other, and transform boundaries where plates slide past each other. Most volcanic and earthquake activity occurs at plate boundaries as the vast plates shift and grind against each other. Over time, the recycling of ocean crust through subduction means new crust is continually generated at mid-ocean ridges and old crust is destroyed and melted back into the mantle.

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    © All Rights Reserved
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    Name______________________________________________Date____________________________Block_____

    Plate Tectonics
    One of the major questions with the Theory of
    Continental Drift is how does it work? We live on a  Type II Ocean – Continental: when ocean
    dynamic Earth, in which about twenty 60-mile thick crust subducts under continental crust
    lithosphere plates move about on the fluid upper forming mountain chains and volcanic
    mantle. The plates jostle with each other, some hit activity
    each other head on, some go under one another, and
    some just slide by each other. Most of the volcanoes
    and earthquakes on Earth happen where these plates
    meet.

    Plate tectonics emphasizes that new ocean crust is


    produced at the midocean ridges. This new crust
    begins to spread to either side of the ridge. As it
    spreads, it dives under another plate and is subducted
    back into the upper mantle. At some geologic time in
    the future, the recycled crust appears again at a mid-
    ocean ridge.
    There are three types of plate interaction
     Divergent Plate Boundaries
     Convergent Plate Boundaries  Type III Continental – Continental: when
     Transform Plate Boundaries two continental plates meet and buckle up
    Divergent Plate Boundaries are where plates are forming large mountains.
    moving away from each other. This movement is
    found along the midocean ridges where new crust
    material is being created.

    Transform Plate Boundaries are when plates move


    side by side with each other resulting in frequent
    Convergent Plate Boundaries are where one plate earthquakes.
    dives (subducts) under less dense crust to be recycled
    back into the asthenosphere. There are three types of
    convergent plate boundaries:
     Type I Ocean – Ocean: when the ocean crust
    of two plates meet usually forming island
    arcs
    Fig. 1: Global Lithospheric Plates’ Relative Motion and Speed
    Data Analysis
    1. Look at Fig 1: Global
    Lithospheric Plates’
    Relative Motion.

    2. Determine what type


    of plate boundary
    exists between each
    of the 2 plates in
    Table 1.

    Plate Boundary Boundary Type


    North American plate & the Pacific Plate near California
    Nazca Plate & the South American Plate
    South American Plate & the African Plate
    Pacific Plate & the Nazca Plate
    Juan DeFuca Plate & the Pacific Plate
    Juan DeFuca Plate & the North American Plate
    Australian Plate & the Eurasian Plate
    North American Plate & the African Plate
    Pacific Plate & the Philippine Plate
    Indian Plate & the Eurasian Plate
    Questions
    1. Explain why the term recycling is an excellent description of plate tectonics.
    ______________________________________________________________________________________
    ______________________________________________________________________________________
    ______________________________________________________________________________________
    2. Explain how tectonic plate movement could create another supercontinent like Pangaea.
    ______________________________________________________________________________________
    ______________________________________________________________________________________
    ______________________________________________________________________________________
    3. If the Earth’s core provides the heat that drives plate tectonics, then what will eventually happen as the
    Earth’s core cools down over billions of years?
    ______________________________________________________________________________________
    ______________________________________________________________________________________
    ______________________________________________________________________________________
    4. What are the various ways in which lithospheric plates interact with each other as they move around on a
    dynamic (meaning moving) Earth?
    ______________________________________________________________________________________
    ______________________________________________________________________________________
    ______________________________________________________________________________________

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