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Feb 13, 2012 · The document discusses plate tectonics and the structure and dynamics of the Earth's interior. It describes how the crust is broken into plates that move atop the mantle due to convection currents, and the three types of plate boundaries: divergent where plates move apart, convergent where they move together, and transform where they slide past ...
Jul 31, 2019 · There are nine major tectonic plates and three types of plate boundaries - divergent boundaries which create mid-ocean ridges and rift valleys, convergent boundaries which cause subduction and mountain building, and transform boundaries where plates slide past each other like the San Andreas Fault.
Plate Tectonics Seafloor spreading : new ocean crust is formed at ocean ridges and destroyed at deep-sea trenches (Geologist, Henry Hess) Age Evidence – Rocks along the mid-ocean ridges are...
Jul 14, 2014 · Plate tectonics is the theory that Earth's outer shell is divided into several plates that glide over the mantle, the rocky inner layer above the core. The plates act like a hard and rigid shell compared to Earth's mantle. This strong outer layer is called the lithosphere.
There are 12 major plates on Earth, each of which slide around at a rate of centimetres per year, pulling away from, scraping against or crashing into each other. Each type of interaction produces...
Plate Tectonics: How It Works. John Wiley & Sons, 2009. Courtesy of Tanya Atwater. Used with permission. Flipbook style reconstruction of continental movement removed due to copyright restrictions. Download the PPT from the PLATES project. Courtesy of Geological Society of America.
8 Theory of Plate Tectonics Earth’s plates are in constant, slow motion Between 2.5 and 15 cm per year! Explains how plates move and form Since you’ve been alive, plates have moved more...
Oct 9, 2014 · Tectonic Plates Today plate boundaries are determined by examining the location of volcanoes and earthquakes. Volcanoes result from the friction (heat) of the plates motion. Earthquakes occur where plate rub against one another. Tectonic Plates Our final piece of evidence is the magnetic record of the ocean floor.
Aug 21, 2015 · There are nine major tectonic plates and three types of plate boundaries - divergent boundaries which create mid-ocean ridges and rift valleys, convergent boundaries which cause subduction and mountain building, and transform boundaries where plates slide past each other like the San Andreas Fault.
Plate tectonics is the theory that Earth's outer layer is made up of plates, which have moved throughout Earth's history. This theory also explain how and why volcanoes, earthquakes and mountains are formed. Exactly what drives plate tectonics is not known. One theory is that convection within the Earth's mantle pushes the plates.
