How is the upper mantle different from the lower mantle?
Answers
Answer:
the viscosity is greater in upper mantle whereas the viscosity is lesser in lower mantle. There is less pressure in upper mantle and the pressure of lower mantle is far greater
Introduction to Upper mantle and its how is it different from Lower mantle -
Explanation:
The speed of the seismic waves changes from the lower part of the crust to the upper mantle, the speed slows down.
Therefore, there is a disjoint position between the crust and the upper mantle. Its first discovery In 1909 by Mohorovice. Therefore, it is also called Moho disambiguation or simply Moho.
The thickness of the upper mantle is 1,000, km from Moho disambiguation. , But the International Union Geodesy and Geophysics has considered its thickness 200 km (400 km as per initial opinion) from the Moho unconformity, which is absolutely different from the lower mantle.