Tectonic Plates

    vintage
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    Post by vintage on Fri May 29, 2009 8:43 am

    All Continentes are on, such called "Tectonic Plates"(tek-ton-nic).These plates move in certain derections that can cause, Earthquakes, Volcanic eruptions, Tsunamis and much more!


    Tectonic Plates Picv10


    Last edited by vintage on Fri May 29, 2009 5:31 pm; edited 1 time in total
    norgolbo
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    Post by norgolbo on Fri May 29, 2009 10:15 am

    Hehe what a cool Volcano ^^
    BTW, the Plates can make Tsunamis too
    They made most part of the world, didn't they?
    Making mountains and oceans,continents and islands...
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    Post by vintage on Fri May 29, 2009 5:36 pm

    Thx for reminding me about thoses extra stuff Very Happy
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    Post by ashley_cool_girl on Sun May 31, 2009 12:39 am

    study TECTONIC PLATES

    Plate tectonics (from the Greek τέκτων; tektōn, meaning "builder" or "mason") describes the large scale motions of Earth's lithosphere. The theory encompasses the older concepts of continental drift, developed during the first decades of the 20th century by Alfred Wegener, and seafloor spreading, understood during the 1960s.

    The outermost part of the Earth's interior is made up of two layers: the lithosphere and the asthenosphere.

    Above is the lithosphere, consisting of the crust and the rigid uppermost part of the mantle.
    Below the lithosphere lies the asthenosphere. Although solid, the asthenosphere has relatively low viscosity and shear strength and can flow like a liquid on geological time scales. The deeper mantle below the asthenosphere is more rigid again due to the higher pressure.
    The lithosphere is broken up into what are called tectonic plates. In the case of Earth, there are eight major and many minor plates (see list below). The lithospheric plates ride on the asthenosphere. These plates move in relation to one another at one of three types of plate boundaries: convergent, or collisional boundaries; divergent boundaries, also called spreading centers; and transform boundaries. Earthquakes, volcanic activity, mountain-building, and oceanic trench formation occur along plate boundaries. The lateral movement of the plates is typically at speeds of 50–100 mm annually.[1]

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