EVERYDAY SCIENCE

Detailed explanation-1: -The asthenosphere is the denser, weaker layer beneath the lithospheric mantle. It lies between about 100 kilometers (62 miles) and 410 kilometers (255 miles) beneath Earth’s surface.

Detailed explanation-2: -The relatively plastic layer of the upper mantle of the Earth on which the tectonic plates of the lithosphere move. The asthenosphere is approximately 200 km [124 miles] thick and, owing to its depth below the Earth’s surface, warm (  1, 400 degC [2, 640 degF]) but not molten.

Detailed explanation-3: -The temperature of the materials that make up the asthenosphere tend to be just below their melting point. This gives them a plastic-like quality that can be compared to glass . As the temperature of the material increases or as the pressure exerted on the material increases, the material tends to deform and flow.

Detailed explanation-4: -An enlargement of the outer portion of Earth shows that the combined oceanic and continental crust and the outermost portion of the mantle for a brittle layer called the lithosphere. Below the lithosphere within the upper portion of the mantle is a plastic layer of rock called the asthenosphere.