The asthenosphere is solid upper mantle material that is so hot that it behaves plastically and can flow.
Which word best describes the hot weak inner part of the upper mantle which can flow lithosphere asthenosphere core crust?
The asthenosphere is a part of the upper mantle just below the lithosphere that is involved in plate tectonic movement and isostatic adjustments. The lithosphere-asthenosphere boundary is conventionally taken at the 1300 °C isotherm .
Which word best describes the hot inner part of the upper mantle which can flow?
The asthenosphere is solid upper mantle material that is so hot that it behaves plastically and can flow.
What is the hot part of the mantle called?
Mantle plumes are the likely cause of “hot spots,” volcanic regions not created by plate tectonics. As a mantle plume reaches the upper mantle, it melts into a diapir. This molten material heats the asthenosphere and lithosphere, triggering volcanic eruptions.
What is the hot weak inner part of the upper mantle which can flow?
Answer Expert Verified. The asthenosphere is part of Earth’s mantle that is located below the lithosphere.It is a layer of solid rock that has so much pressure and heat the rocks can flow like a liquid.
What happens in the upper mantle?
The upper mantle begins just beneath the crust and ends at the top of the lower mantle. The upper mantle causes the tectonic plates to move . Crust and mantle are distinguished by composition, while the lithosphere and asthenosphere are defined by a change in mechanical properties.
What causes the mantle to flow?
Many geologists believe that the mantle “flows” because of convection currents . Convection currents are caused by the very hot material at the deepest part of the mantle rising, then cooling, sinking again and then heating, rising and repeating the cycle over and over.
Why is the mantle the thickest layer?
Below the crust is the mantle, a dense, hot layer of semi-solid rock approximately 2,900 km thick. The mantle, which contains more iron, magnesium, and calcium than the crust, is hotter and denser because temperature and pressure inside the Earth increase with depth .
What is the best description of the path of S waves and P waves?
What is the best description of the paths of S waves and P waves? – S waves travel through solids, liquids, and gasses . P waves travel through solids or very dense, glassy liquids.
Is the lower mantle solid or liquid?
The lower mantle is the liquid inner layer of the earth from 400 to 1,800 miles below the surface. The lower mantle has temperatures over 7,000 degrees Fahrenheit and pressures up to 1.3 million times that of the surface near the outer core.
Which is hotter mantle or crust?
New data suggests that the upper parts of Earth’s mantle are around 60°C (108°F) hotter than previously expected. ... Previous estimates have put temperatures ranging from anywhere between 500 to 900°C (932 to 1,652°F) near the crust, to 4,000°C (7,230°F) closer to Earth’s core.
Is the mantle the hottest layer?
The inner core is the hottest layer, above 9000 Fahrenheit and it is 1250 km thick! Crust: The Earth’s thinnest layer! Mantle: The Earth’s thickest layer! Inner Core: The hottest Earth layer!
What is the middle of the mantle?
the middle mantle is another name for asthenosphere and is below the lithosphere and for example your vechile encounters materialsthat is hotter and under increasing pressure.
What is an example of asthenosphere?
The upper layer of asthenosphere under the South American plate , for example, is moving inexorably westward. ... The plates constitute the hard lithosphere – literally, ‘sphere of rock’ – which floats atop the hot, semi-molten asthenosphere – ‘sphere of weakness’.
What keeps Earth’s asthenosphere pliable?
The outermost layer of Earth, lithosphere, a rocky and brittle layer, is broken into pieces called plate tectonics. The plate tectonics float/move over the asthenosphere. Convection currents in the mantle cause the plate tectonic’s movement.
What is the main difference between the two layers of the mantle?
There are very small differences between the two layers. The upper mantle has Olivine (a very special rock), compounds with silicon dioxide, and a substance called Peridotite . The lower mantle is more solid than the upper mantle.
