Plate tectonics is the theory proposing that Earth's outer rocky shell is divided into seven major and several smaller rigid plates, and that forces generated by heat losses from the planet's interior constantly move the plates about. Tectonic plates are huge slabs of the Earth’s crust, which fit together like pieces of a puzzle. Recent research ties plate tectonic activity to the burst of evolution called the Cambrian explosion, 541 million years ago, when a stunning array of new, complex life arose.. A New Dimension to Plate Tectonics . Before the birth of plate tectonics theory, studying geology was essentially an exercise in collecting (apparently disparate) facts and memorizing information. Welcome to Britannica School, a safe, up-to-date, and age-appropriate information resource for Elementary, Middle, and High School.. Discover encyclopedia articles, multimedia, primary sources, games, and other learning resources that support student research and reinforce curriculum standards. The plates are not fixed but are constantly moving atop a layer of solid and molten rock called the mantle. Global tectonics based on a model of the earth characterized by a small number (10-25) of semirigid plates which float on some viscous underlayer in the mantle; each plate moves more or less independently and grinds against the others, concentrating most deformation, volcanism, and seismic activity along the periphery. In addition to the accepted roles of plate tectonics in regulating planetary habitability through the composition of the atmosphere and temperature, and creating continents to enhance land-based evolution and biodiversity, it has a hitherto unexplored role in influencing surface mineralogy with possible implications for early evolution. This theory has experienced further developments over the last 50 years since its advent in 1967–68. Cameron’s record-setting dive was not the only expedition to demonstrate a connection between plate tectonics and ocean life. Sometimes these plates collide, move apart, or slide next to each other.
An onset of plate tectonics on Earth around 3 Ga may have led to the production and growth of DM and EM mantle sources after this time.


Since then, plate tectonics has arguably become a standard model in Earth science. Plate Boundaries The Ring of Fire is the result of plate tectonics. In December 2015, researchers in Australia published a study of roughly 300 drill cores … New tools to model and visualize subduction zones in 3-D are providing researchers with insights into the gaps inherent in the theory of plate tectonics.


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