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    Plate Tectonics The Ever-Changing Earth (NOTES)

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    The document discusses plate tectonics and the structure of Earth's surface. It explains that Earth's outer layer, called the lithosphere, is made up of large tectonic plates that are constantly moving. The plates interact along their boundaries through converging, diverging, and sliding past one another, causing seismic and volcanic activity. In the past, all the continents were joined together in a supercontinent called Pangea, but began separating about 200 million years ago due to the motions of the tectonic plates.

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    Plate Tectonics The Ever-Changing Earth (NOTES)

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    jasmine's files
    74 views1 page
    The document discusses plate tectonics and the structure of Earth's surface. It explains that Earth's outer layer, called the lithosphere, is made up of large tectonic plates that are constantly moving. The plates interact along their boundaries through converging, diverging, and sliding past one another, causing seismic and volcanic activity. In the past, all the continents were joined together in a supercontinent called Pangea, but began separating about 200 million years ago due to the motions of the tectonic plates.

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    The document discusses plate tectonics and the structure of Earth's surface. It explains that Earth's outer layer, called the lithosphere, is made up of large tectonic plates that are constantly moving. The plates interact along their boundaries through converging, diverging, and sliding past one another, causing seismic and volcanic activity. In the past, all the continents were joined together in a supercontinent called Pangea, but began separating about 200 million years ago due to the motions of the tectonic plates.

    Copyright:

    © All Rights Reserved
    Download as PDF, TXT or read online from Scribd
    Download as pdf or txt
    74 views1 page

    Plate Tectonics The Ever-Changing Earth (NOTES)

    Uploaded by

    jasmine's files
    The document discusses plate tectonics and the structure of Earth's surface. It explains that Earth's outer layer, called the lithosphere, is made up of large tectonic plates that are constantly moving. The plates interact along their boundaries through converging, diverging, and sliding past one another, causing seismic and volcanic activity. In the past, all the continents were joined together in a supercontinent called Pangea, but began separating about 200 million years ago due to the motions of the tectonic plates.

    Copyright:

    © All Rights Reserved
    Download as PDF, TXT or read online from Scribd
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    of 1

    Unit 1: Earth and Space Chapter 1: Plate Tectonics:

    The Ever-Changing Earth

    Continental Drift Plate Tectonics The "Lithosphere" is


    Alfred Wegener (1880 - 1930) The discovery of the "plate tectonic composed of several
    A German meteorologist and theory" gave scientists the idea that the tectonic plates, which
    geophysicist he noticed that the earth's surface is not a static and intact are constantly in
    landscape but an ever-changing motion with respect
    continent fit together like puzzle
    structure composed of several to each other. There
    pieces.
    are seven major
    He proposed the Continental Drift segments called tectonic plates.
    plates: North & South
    Hypothesis American Plate,
    There are two classification of plates:
    Pacific Plate, African
    Oceanic Plate: the crust of the ocean
    Plate, Eurasian Plate,
    Evidences of continental drift is characterized by a thin but dense Australian-Indian
    lithosphere composed mainly of
    theory: basalt.
    Plate and Antarctic
    Plate. And there are
    The coastlines of the continents fit Continental Plate: this plate is also several smaller
    together like a jigsaw puzzle. thicker than the oceanic plate but plates or
    Identical fossils of organisms were less dense and is mainly composed "microplates".
    discovered on different continents of granite.
    suggesting that land connection
    between continents existed in the
    past.
    Certain continents share common
    geological features, such as mountain
    ranges, rock types, minerals and
    resources.

    Concept of Plate Tectonics: Pangea (all lands)


    Was formulated in the 1960's. Pangea, in early
    The theory of plate tectonics is the geologic time, was
    modern update to continental drift. a supercontinent
    According to the theory, Earth has a that incorporated
    almost all the
    rigid outer layer, knows as the
    landmasses on
    lithosphere, which is typically about
    Earth.
    100km (60 miles) thick and overlies a
    Pangea began to
    plastic (moldable, partially molten break up about
    layer called the asthenosphere.) 200 million years
    The lithosphere is broken up into ago in the same
    seven very large continental- and way that it was
    ocean sized plates, six or seven formed: through
    medium-sized regional plates, and tectonic plate
    several small ones. These plates movement caused
    move relative to each other, typically by mantle
    at rates of 5 to 10 cm (2 to 4 inches) convection.
    per year, and interact along their
    boundaries, where they converge,
    diverge, or slip past one another.
    Such interactions are thought to be
    responsible for most of Earth's
    seismic and volcanic activity,
    although earthquakes and volcanoes
    can occur in plate interiors.
    The Wilson Cycle, a concept that
    describes the lifecycles of oceans
    and continents.
    Convection is the observation that
    the most active geology takes place
    on plate boundaries.

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