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the theory of plate tectonics
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Asked 6/10/2011 7:49:02 AM
Updated 6/30/2014 10:03:14 AM
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User: The theory of pangea

User: the theory of plate tectonics

Weegy: 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. ]
tegler|Points 15|

User: the theory of seafloor spreading

User: What geochemical cycle envolves mantle convection

Question
Asked 6/10/2011 7:49:02 AM
Updated 6/30/2014 10:03:14 AM
3 Answers/Comments
This conversation has been flagged as incorrect.
Flagged by alfred123 [6/30/2014 10:02:00 AM]
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The theory of Pangea is that millions of years ago all the continents were joined together in one enormous land mass known as Pangea.
Added 6/30/2014 10:02:01 AM
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Plate tectonics is the scientific theory that attempts to explain the movements of the Earth's lithosphere that have formed the landscape features we see across the globe today.
Added 6/30/2014 10:02:21 AM
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Confirmed by andrewpallarca [6/30/2014 10:04:11 AM]
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The seafloor spreading hypothesis is a theory that oceanic crust forms along submarine mountain zones, known collectively as the mid-ocean ridge system, and spreads out laterally away from them.
Added 6/30/2014 10:03:14 AM
This answer has been confirmed as correct and helpful.
Confirmed by andrewpallarca [6/30/2014 10:04:22 AM]
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