D'', "D-double-prime," for lack of a better name
The lower part of the mantle is actually names the mesosphere. It is overlain by the asthenosphere which is part of the upper mantle and this in turn is overlain by the lithosphere which is made up of the very uppermost mantle and the crust.
The mesosphere
I believe that is convection.
The part of the Earth between the crust and the mantle is called the lithosphere. It includes the Earth's crust and the uppermost portion of the mantle, which together form a rigid layer. Below the lithosphere lies the asthenosphere, a semi-fluid layer of the mantle that allows for tectonic plate movement.
Earth's crust and brittle upper mantle is called the lithosphere.
The part of the mantle below the lithosphere is called the Asthenosphere.
The lower part of the mantle is called the mesosphere.
The lower part of the mantle is called the "lower mantle" or "mesosphere", while the upper part of the mantle is referred to as the "upper mantle" or "asthenosphere".
It's called the lower mantle.
Although the bottom of the lithosphere is also part of the mantle, the answer is the mantle.
Upper Mantle
The top part of a fireplace mantle is called the mantel shelf. It is the horizontal ledge that extends across the top of the fireplace to display decorative items.
The bottom part of the mantle is not molten primarily due to the immense pressure exerted by the overlying layers of the Earth. This pressure raises the melting point of the mantle materials, causing them to remain solid despite the high temperatures. Additionally, the mantle is composed of silicate minerals that have high melting points, which further contributes to its solid state in the lower mantle.
The lower part of the mantle is actually names the mesosphere. It is overlain by the asthenosphere which is part of the upper mantle and this in turn is overlain by the lithosphere which is made up of the very uppermost mantle and the crust.
The top part of a wave is called the crest, while the bottom part is called the trough.
The mesosphere
Lithosphere