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What is the weaker hotter zone beneath the lithosphere that allows for motion of earths rigid outer shell?
The weaker, hotter zone beneath the lithosphere is called the asthenosphere. It is semi-fluid and allows for the motion of the Earth's rigid outer shell, or lithosphere, due to its high temperature and partial melting that makes it more ductile compared to the overlying lithosphere.
Can Small amounts of water can lower partial melting temperatures in silicate rocks?
Yes, small amounts of water can lower the partial melting temperatures of silicate rocks by promoting the breakdown of mineral structures, reducing viscosity, and increasing mobility of magma. Water can act as a flux, helping to facilitate melting at lower temperatures.
What does the asthenosphere have the ability to do?
The asthenosphere can flow slowly due to its high temperature and partial melting of rock, allowing tectonic plates to move on the more rigid lithosphere above it. This flow can create convection currents that drive plate movements and lead to processes such as seafloor spreading and subduction.
How does the silica content of earths crust under the oceans get magma?
Silica-rich magma forms in mid-ocean ridges due to partial melting of the upper mantle, as a result of increased temperature and decreased pressure. This magma rises through cracks in the oceanic crust and can eventually erupt at the surface as lava.
Can Small amounts of water lower partial melting temperatures in silicate rocks?
Yes, small amounts of water can lower the partial melting temperatures of silicate rocks by promoting the breaking of chemical bonds and reducing the viscosity of the rock. This can lead to increased melting and magma formation at lower temperatures compared to dry conditions.
What is the hot weak zone found within the upper mantle?
The hot weak zone found within the upper mantle is known as the asthenosphere. It is characterized by high temperatures and partial melting, resulting in a layer of partially molten rock material that allows the lithospheric plates to move gradually over time. The asthenosphere plays a critical role in plate tectonics and the movement of Earth's crustal plates.
What is the weaker hotter zone beneath the lithosphere that allows for motion of earths rigid outer shell?
The weaker, hotter zone beneath the lithosphere is called the asthenosphere. It is semi-fluid and allows for the motion of the Earth's rigid outer shell, or lithosphere, due to its high temperature and partial melting that makes it more ductile compared to the overlying lithosphere.
Why is the asthenosphere able to flow like plastic?
The asthenosphere can flow like a plastic because it is composed of partially melted rock that has a high temperature and pressure. This partial melting allows the rock to deform and flow slowly over long periods of time, similar to how plastic can be molded and shaped under the right conditions.
What rocks would exhibit evidence of partial melting?
Rocks such as migmatites, which are a mixture of igneous and metamorphic rock formed through partial melting, would exhibit evidence of this process. Additionally, some granites and gneisses can show signs of partial melting due to the presence of melt pockets or segregated mineral assemblages.
What is the adjective of vacuum?
of containing, producing, or utilizing a partial vacuum
Can Small amounts of water can lower partial melting temperatures in silicate rocks?
Yes, small amounts of water can lower the partial melting temperatures of silicate rocks by promoting the breakdown of mineral structures, reducing viscosity, and increasing mobility of magma. Water can act as a flux, helping to facilitate melting at lower temperatures.
Would pressure play a role in partial melting?
In so far as pressure affects the melting point of substances, the answer is yes.
Give facts about the asthenosphere?
1. About 85 kilometers thick. 2. A layer of the Earth that lies at a depth of 60--150 mi (100--250 km) beneath Earth's surface.3. It was first named in 1914 by the British geologist J. Barrell4. The asthenosphere gets its name from the Greek word for weak, asthenis, because of the relatively fragile nature of the materials of which it is made.
Why is the outer part of the crust a liquid?
The outer part of the Earth's crust is not liquid; it is solid. However, the uppermost layer of the mantle, known as the asthenosphere, is partially molten, which allows the tectonic plates to move over it. This layer's partial melting contributes to the movement of the Earth's lithosphere.
What is a dilapidated?
In a condition of partial ruin or disrepair
What is the condition of partial lack of hair?
ALOPECIA
What is thought to form by partial melting and in situ crystallization of the melted portion?
migmatite
