The Lithosphere-Asthenosphere boundary is defined by a difference in response to stress: the lithosphere remains rigid for very long periods of geologic time in which it deforms elastically and through brittle failure, while the asthenosphere deforms viscously and accommodates strain through plastic deformation. ©Copyright The asthenosphere is the layer of our planet that lies beneath the lithosphere. Eurasian Plate. The lithosphere is surrounded by the atmosphere above and the asthenosphere below. middle layer lies beneath the lithosphere and can flow like a liquid Seismic waves moving through the LAB, travel faster across the lithosphere than the asthenosphere. The aforementioned occurrence, at a certain depth and temperature gives rise to the asthenosphere layer. This occurs in areas where there are divergent plate boundaries usually The balance between pressure and temperature is such that the rocks in this layer of the earth have little strength, and they behave like butter under a knife. flow toward the Earth's surface. The continental lithosphere is comprised of igneous rock called felsic rock. This allows the tectonic plates in the lithosphere to move around on the Earth's surface. reserved. The lithosphere is the layer of the earth that contains the coastal plates. If you have ever dunk slush, you can understand the condition of the rocks inside this layer of the earth. The Lithosphere is composed of the crust and upper most solid mantle. P-waves and s-waves are A.E.H. (adsbygoogle = window.adsbygoogle || []).push({}); Copyright © 2010-2018 Difference Between. Mechanically, the earth’s layers can be divided into lithosphere, asthenosphere, mesospheric mantle (part of the Earth’s mantle below the lithosphere and the asthenosphere), outer core, and inner core. 1. His theory divided the Earth's interior into three parts including the lithosphere, asthenosphere, and the centrosphere. Scientists studying s-waves found • The difference between lithosphere and Asthenosphere pertain to their compositions. The subducting plate is forced into the When a continental plate and oceanic plate collide, the continental plate scrapes off the oceanic plate's top layers, which are called terranes. The asthenosphere is the layer of our planet that lies beneath the planet Earth, lies beneath the top two layers and goes all the way to The Kids Fun Science Bookstore covers a wide range of earth science topics. point. He divided the earth’s crust into three major … A.E.H. It is composed of all the rocks and other solid surface that we see on the surface in the form of soil, hills, and mountains. They proposed gravity anomalies over the continental crust, where a strong upper layer floated over a weak lower layer i.e. The speed of the seismic waves decreases as the rigidity decreases in this zone. Although the rocks of the lithosphere are still considered elastic, they are not viscous. Convection force also causes the lithosphere plates at the ocean ridges to move apart[vi]. Most of the asthenosphere is solid but could be melted depending on its location. What is the difference between Lithosphere and Asthenosphere? asthenosphere. Which forms a part Geology; the science that deals with the earths structure, history, and its’ processes. Pacific Plate. Analysis of the earthquake waves confirmed the presence of the asthenosphere. • Lithosphere stretches from the top of … When crustal plates sink into the earth's mantle deep zone earthquakes can occur in the asthenosphere. The lithosphere contains 15 major tectonic plates, namely: Convection caused by heat from lower layers of the earth, drives the asthenospheric flow, which causes the tectonic plates in the lithosphere, to start to move. found that this layer's boundaries can be defined by the speed of Difference Between Longitude and Latitude, Difference Between SLST (Sri Lanka Standard Time) and UTC, Difference Between Coronavirus and Cold Symptoms, Difference Between Coronavirus and Influenza, Difference Between Coronavirus and Covid 19, Difference Between Dietician and Nutritionist, Difference Between Thixotropic and Pseudoplastic, Difference Between Allelic and Locus Heterogeneity, Difference Between Electropolishing and Passivation, Difference Between Holandric and Sex Linked Gene, Difference Between Electropositive and Electronegative Radicals, Difference Between Amacrine and Horizontal Cells, Difference Between Gametic Sporic and Zygotic Meiosis, Difference Between Potassium Ferrocyanide and Potassium Ferricyanide. Interesting Lithosphere Facts: The word lithosphere is derived from the Greek words 'litho' which means 'rocky', and 'sphaira' which means 'sphere'. It has also been compared to the way toothpaste flows out of a tube when squeezed. Coming from Engineering cum Human Resource Development background, has over 10 years experience in content developmet and management. that these waves slowed down at 100 km (62 mi) beneath the Earth's surface and sped up at 250 km (155 mi) within the Earth. he divided the interior of the Earth into three parts. The • The mineral composition of lithosphere is varied as it contains more than 80 minerals whereas Asthenosphere is mainly comprised of silicates of iron and magnesium. The physical structure is mostly solid with some regions containing partially molten rock, which exhibits plastic properties, Characterized as elastic and less ductile, Has a higher degree of ductility than the lithosphere, Ranges from a depth of 80km and 200 km below the earths surface, Extends to a depth of 700km below the earths’ surface, Approximate temperature of 400 degrees Celsius, Approximate temperature ranging from 300 to 500 degrees Celsius, Has a lower density than the asthenosphere, Asthenosphere is denser than the lithosphere, Seismic waves travel at faster speeds across lithosphere, Seismic waves travel 5 to 10% slower in asthenosphere than in lithosphere, Rocks are under much less pressure forces, Chemical composition consists of 80 elements and approximately 2000 minerals, Asthenosphere is mainly composed of iron-magnesium silicates, Oceanic lithosphere – a denser oceanic crust, with an average density of 2.9 grams per cubic centimetre, Continental lithosphere – a thicker crust that stretches 200km below the surface of the earth, with an average density of 2.7 grams per cubic centimetre. Converging plates in subduction zones also allow molten rock to Scientists study the asthenosphere using seismographs that record earthquake waves. Thus, the outermost layer of the earth that is visible to us in the form of the surface is called Lithosphere. The Lithosphere-Asthenosphere boundary is defined by a difference in response to stress: the lithosphere remains rigid for very long periods of geologic time in which it deforms elastically and through brittle failure, while the asthenosphere deforms viscously and accommodates strain through plastic deformation. The lithosphere's main plates include the African Plate, the Antarctic Plate, the Eurasian Plate, the Indo-Australian Plate, the North American Plate, the South American Plate, and the Pacific Plate. The mafic crust is made up of silicate mineral that is rich in iron and magnesium.

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