Question

Why is the upper mantle called the asthenosphere?

Answer 1

heya!!!

The upper mantle begins just beneath the crust and ends at the lower mantle. The thickness of the upper mantle is between 200 and 250 miles. The entire mantle is about 1800 miles thick, which means the lower mantle makes up the bulk of this part of the Earth. The temperature of the mantle near the crust ranges from 900 to 1600 degrees Fahrenheit. It gets hotter at greater depths. The lower mantle near the core is as hot as 7000 degrees Fahrenheit.

The upper mantle is not uniform throughout. The topmost, thin layer of it is very similar to the Earth's crust. Together with the crust, we call it the lithosphere. Below the lithosphere is a layer of upper mantle called the asthenosphere

Answer 2

Answer:

The asthenosphere is known to be for its weak layer in the upper mantle. The asthenosphere is made of solid rock, when given heat and pressure, the rocks flow like a liquid. The thickness of asthenosphere depends on the temperature. The name asthenosphere is taken from Greek which means weak sphere.