In comparison, the lithosphere's rocks are more rigid. Our website uses cookies to provide us with data and information that can help us understand our website traffic, customize advertisements, and improve user experience and service delivery. Temperature Below are brief overviews of the five mechanical layers of the Earth: • Lithosphere: The lithosphere is the outermost layer of the Earth that consists of the entire crust and the top-most portion of the mantle. What is the deepest layer? •The asthenosphere (from Greek asthenēs 'weak' + sphere) is the mechanically weak ductily-deforming region of the upper mantle of the Earth. Mesosphere. What are 5 pure elements that can be found in your home? is that mesosphere is mesosphere (layer of the earth's atmosphere) while asthenosphere is (geology) the zone of the earth's upper mantle, below the lithosphere. The asthenosphere (from Greek asthenēs 'weak' + sphere) is the mechanically weak ductily-deforming region of the upper mantle of the Earth. Who are the experts?Our certified Educators are real professors, teachers, and scholars who use their academic expertise to tackle your toughest questions. This is why the lithosphere is further divided into sub-spheres namely the crust, the mantle, the outer core, and the inner core. What are its main features? The crust is made of loose soil and rocks. Test. The mesosphere refers to the mantle in the region between the asthenosphere and the outer core.The upper boundary is defined as the sharp increase in seismic wave velocities and density at a depth of 660 km. INSIDE THE Remember that it is made of solid silicate materials, but the high temperature allows it to flow on very long timescales. The asthenosphere is a solid but it can flow, like toothpaste. Asthenosphere Mesosphere Beneath the asthenosphere is the strong, lower part of the mantle called the mesosphere. Summary. • Lithosphere stretches from the top of the earth’s crust down to first 100 kilometers while Asthenosphere lies beneath lithosphere The lithosphere-asthenosphere boundary is where geophysicists mark the difference in ductility between the two layers. Toothpaste is a solid that can flow. Hence, although it is as hot as the surface of the Sun, there is speculation that the inner core is slowly growing as the liquid outer core at the boundary with the inner core cools and solidifies due to the gradual interior cooling. nl:Mesosfeer (mantel)fi:Mesosfääri (Maan vaippa) So a very close relationship indeed! •The asthenosphere (from Greek asthenēs 'weak' + sphere) is the mechanically weak ductily-deforming region of the upper mantle of the Earth. The asthenosphere is solid upper mantle material that is so hot that it behaves plastically and can flow. In a nutshell, the asthenosphere is part of the Earth, the mesosphere is part of the atmosphere. Note that it is divided between the outer core, which is about 2400 kilometers thick, and the inner core, which has a radius of 1220 kilometers. Still have questions? The asthenosphere is more dense and viscous in comparison to the lithosphere. Whereas the asthenosphere concept was proposed at a later stage in history i.e. The crust and the upper mantle are separated by what is called the Mohorovicic discontinuity. Write. What will happen if all the oceans on Earth suddenly dry up? Spell. Created by. ©2020 eNotes.com, Inc. All Rights Reserved, http://scienceline.ucsb.edu/getkey.php?key=3665. PLAY. Hence, compositional layers and mechanical layers are the two types of layers, Perhaps, the most discussed and cited layers are the compositional layers. Another way to prevent getting this page in the future is to use Privacy Pass. What is LTPS LCD? It is also divided into the upper mantle and lower mantle, both composed of silicate rocks rich in iron and magnesium. In the compositional model: What is the outermost layer? At a depth of 660 km, spinel decomposes into perovskite and magnesiowustite. The lithosphere is the brittle crust and uppermost mantle. Their mechanical properties, including how they deform (e.g. http://www.ck12.org/earth-science/Lithosphere-and-Asthenosphere/lesson/Lithosphere-and-Asthenosphere-HS-ES/, https://www.khanacademy.org/science/cosmology-and-astronomy/earth-history-topic/plate-techtonics/v/compositional-and-mechanical-layers-of-the-earth, CC BY-NC-SA: Attribution-NonCommercial-ShareAlike. • The difference between lithosphere and Asthenosphere pertain to their compositions. The structure of the Earth consists of various spherical shells or layers that can be categorized in two manners: either by their chemical compositions or mechanical properties. Crust and mantle refer to changes in the chemical composition of the Earth. Why do coal miners keep hoping the mines will reopen? Lithosphere is made up of Earth's outermost layer, the crust, and the uppermost portion of the mantle. What is the defining difference between the lithosphere, asthenosphere, mesosphere, outer core, and inner core? • The lithosphere is composed of both the crust and the portion of the upper mantle that behaves as a brittle, rigid solid. What is the difference between the asthenosphere and the mesosphere? At the heart of our business is a pronounced commitment to empower business, organizations, and individuals through our informative contents. [1] This reaction marks the boundary between upper mantle and lower mantle. The liquid, semi-solid, and solid land components of the lithosphere form layers that are chemically and physically different. What is IGZO Display? What would have happened if oceanic crust is not destroyed in trenches, but formation of new crust goes on along mid-ocean ridges. What is the composition and mechanical property of the mesosphere relative to the asthenosphere? Start your 48-hour free trial and unlock all the summaries, Q&A, and analyses you need to get better grades now. Since it is rigid and brittle, when stresses act on the lithosphere, it breaks. The base of the lower mantle is at about 2900 km. Summary. The layer lies above the mesosphere but below the exosphere. The lithosphere-asthenosphere boundary is where geophysicists mark the difference in ductility between the two layers. Our summaries and analyses are written by experts, and your questions are answered by real teachers. How do you calculate the number of neutrons? It lies below the lithosphere, at depths between 100 and 200 km (~ 62 and 124 miles) below the surface, but perhaps extending as deep as 400 km (~ 249 miles). Terms in this set (15) convection current. However, at the upper mantle, high temperatures make the silicate material considerably ductile, thus allowing it to flow. Although we sometimes refer to Earth’s plates as being plates of crust, the plates are actually made of lithosphere.