what layer of the earth is completely solid
The asthenosphere is the layer of the Earth that lies below the lithosphere. It is a layer of solid rock that has so much pressure and heat the rocks can flow like a liquid. The rocks are less dense than the rocks in the lithosphere. This allows the tectonic plates in the lithosphere to move around on the Earth's surface by floating on the rocks that are slowly flowing like a liquid.
The upper part of lithosphere is extremely solid but it also includes the uppermost part of the mantle, which is in liquid form and mobile. Lithosphere mainly consists of granite and basalt but more than 80 other elements are also found in the crust.