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1. [ST8.2] - Zanesville City Schools
1. [ST8.2] - Zanesville City Schools

... A. Glaciers melt and form rivers ...
MT1_mtmeth
MT1_mtmeth

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Plate Tectonics - Rockaway Township School District
Plate Tectonics - Rockaway Township School District

... ESS2.B: Plate Tectonics and Large-Scale System Interactions • Maps of ancient land and water patterns, based on investigations of rocks and fossils, make clear how Earth’s plates have moved great distances, collided, and spread apart. ESS2.C: The Roles of Water in Earth’s Surface Processes • Water’s ...
Background Info SBTaylor
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... A. The theory of plate tectonics is a recent development in the geological sciences, really accepted by scientific community since the early 1960's. Earlier in the century geologic paradigm was dominated by the belief that ocean basins and continental land masses were permanent and fixed on the surf ...
normal fault - Madison County Schools
normal fault - Madison County Schools

... • In many faults, the fault line is slanted. So the block of rock on one side of the fault is above the bock of rock on the other side of the fault. The overhead wall is called the hanging wall. The downward block is called the footwall. ...
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Fore-arc basin

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OH NO… Good Shot – TRY AGAIN!
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... 3. Explain your observations – why do the earthquakes and volcanoes occur in these areas?  ...
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... rift. Escape of hot plume material from beneath VRM accelerates subsidence there. ...
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The generation of plate tectonics from mantle convection. Earth and
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... the mantle. The red sphere represents the core, and yellow mushroom-shaped structures are hot upwelling plumes. The blue structures represent cold downwellings which, near the surface, are linear and sheet-like, crudely similar to the planar structure of subducting slabs on Earth. Many dissimilariti ...
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Three-dimensional magnetotelluric imaging of crustal and

... (Siripunvaraporn et al., 2005) and Modular system for Electromagnetic Inversion (ModEM; Egbert & Kelbert, 2012). There is a general good agreement between the main features obtained from the 2-D models and the new results of the 3-D modelling. Models inverting for only off-diagonal tensor components ...
Activity 4
Activity 4

... the continent grows larger at its edge. Continents also grow as the igneous rock of volcanoes and batholiths are added to the continent above the subduction zone, as described above.The growth of a continent along its edge in these ways is called continental accretion.This has been going on through ...
Earth's Heat
Earth's Heat

... The radiogenic heat estimation from the geoneutrinos research is 24 terrawatts. That's about half of Earth's total heat flux, with the remainder assumed to be residual heat from the planet's formation, accretion, and differentiation. This is not a total surprise based on models already formulated fo ...
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Plate tectonics



Plate tectonics (from the Late Latin tectonicus, from the Greek: τεκτονικός ""pertaining to building"") is a scientific theory that describes the large-scale motion of Earth's lithosphere. This theoretical model builds on the concept of continental drift which was developed during the first few decades of the 20th century. The geoscientific community accepted the theory after the concepts of seafloor spreading were later developed in the late 1950s and early 1960s.The lithosphere, which is the rigid outermost shell of a planet (on Earth, the crust and upper mantle), is broken up into tectonic plates. On Earth, there are seven or eight major plates (depending on how they are defined) and many minor plates. Where plates meet, their relative motion determines the type of boundary; convergent, divergent, or transform. Earthquakes, volcanic activity, mountain-building, and oceanic trench formation occur along these plate boundaries. The lateral relative movement of the plates typically varies from zero to 100 mm annually.Tectonic plates are composed of oceanic lithosphere and thicker continental lithosphere, each topped by its own kind of crust. Along convergent boundaries, subduction carries plates into the mantle; the material lost is roughly balanced by the formation of new (oceanic) crust along divergent margins by seafloor spreading. In this way, the total surface of the globe remains the same. This prediction of plate tectonics is also referred to as the conveyor belt principle. Earlier theories (that still have some supporters) propose gradual shrinking (contraction) or gradual expansion of the globe.Tectonic plates are able to move because the Earth's lithosphere has greater strength than the underlying asthenosphere. Lateral density variations in the mantle result in convection. Plate movement is thought to be driven by a combination of the motion of the seafloor away from the spreading ridge (due to variations in topography and density of the crust, which result in differences in gravitational forces) and drag, with downward suction, at the subduction zones. Another explanation lies in the different forces generated by the rotation of the globe and the tidal forces of the Sun and Moon. The relative importance of each of these factors and their relationship to each other is unclear, and still the subject of much debate.
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