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Asthenosphere
The deepest layer of the lithosphere is called the asthenosphere. It is located just below the lithosphere and is made up of partially molten rock that allows the lithosphere to move and float on top of it. The asthenosphere plays a crucial role in plate tectonics and the movement of Earth's crustal plates.
The lithosphere is the solid part of the Earth's surface, the crust and uppermost mantle, which is fragmented into plates which "float" over the hotter, more fluid asthenosphere.
The very top of Earth's mantle is known as the lithosphere. It is a rigid layer that consists of both the uppermost part of the mantle and the crust above it. The lithosphere is broken into tectonic plates that float on the semi-fluid asthenosphere beneath it.
While still solid, the asthenosphere is able to flow. The ability of a solid to flow is called plasticity. See "What's the matter?" for an activity to demonstrate plasticity. Since the asthenosphere is more liquid than the rest of the mantle, the broken lithosphere plates are able to "float" on it.
The large sections of the lithosphere that float on the asthenosphere are called tectonic plates
asthenosphere
asthenosphere
Tectonic plates are segments of the lithosphere. They float on top of the asthenosphere.
The Asthenosphere. The Asthenosphere is a part of the Mantle.
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Lithosphere
Asthenosphere
The tectonic plates float on the lithosphere. This overlies the asthenosphere.
Because of something called Isostacy-the gravitational equilibrium between lithosphere and asthenosphere, such that plates "float" at an elevation that dependes on the thickness and density. EX. Think floating ice cubes
Plates of the lithosphere do not float on the core. They float on the asthenosphere (plastic mantle). Due to convection currents and the earths rotation, plates glide over the asthenosphere. This theory is the theory of Plate Tectonics.
As the question uses the word mantle which is a compositional layer of the earth, then the answer is crust.