How does the mantle behave as a viscous fluid on a geological time scale?
Answers
Answer:
On geologic timescales, the mantle behaves as a very viscous fluid and responds to stress by flowing.
Explanation:
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Answer:
The mantle's viscosity varies considerably. The majority of it is solid rock, but at tectonic plate boundaries and mantle plumes, it is less viscous. There are soft mantle rocks that can move plastically under intense pressure and depth over the course of millions of years. The distribution of heat and material in the Earth's mantle influences its topography. Plate tectonics is driven by mantle activity, which also contributes to earthquakes, seafloor spreading, volcanoes, and orogeny (mountain-building).
Explanation:
The physical parameter that controls the strength of the viscous forces that operate when polycrystalline mantle material flows like a liquid over very long timescales is the viscosity of the Earth's mantle. Due to the presence of lava and fluid material, it behaves as a viscous liquid on a geological time scale. The mantle acts as a viscoelastic solid and possesses a plastic deformation limit. When shear applies to liquid and exceeds its threshold value then it moves like a liquid due to the composition present in it. Therefore, earth's mantle acts as a viscous liquid.
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