I'm guessing here so don't take this as a reliable answer, however I would guess that it is because they move about due to the movements of the liquid magma in the mantle moving about (probably convectional currents controlling it)
Lithosphere
The large sections of lithosphere that float on the asthenosphere are called tectonic plates. These plates are rigid sections of Earth's lithosphere that move and interact with each other at plate boundaries, causing geological phenomena like earthquakes and volcanic eruptions.
The plates of lithosphere float on top of the semi-fluid asthenosphere, which is located beneath the lithosphere in the Earth's upper mantle. The asthenosphere allows the plates to move and interact with each other due to its partially molten and more ductile nature compared to the lithosphere above it.
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.
Plates float on the semi-fluid asthenosphere layer, which is part of the upper mantle. This layer is under the lithosphere and allows the movement of the tectonic plates.
The tectonic plates float on the lithosphere. This overlies the asthenosphere.
the ductile athenosphere.
the ductile athenosphere.
Tectonic plates are segments of the lithosphere. They float on top of the asthenosphere.
l;k
Asthenosphere
The tectonic plates, part of the lithosphere, move around and float on the top of the asthenosphere.
Lithosphere
The large sections of lithosphere that float on the asthenosphere are called tectonic plates. These plates are rigid sections of Earth's lithosphere that move and interact with each other at plate boundaries, causing geological phenomena like earthquakes and volcanic eruptions.
The plates of lithosphere float on top of the semi-fluid asthenosphere, which is located beneath the lithosphere in the Earth's upper mantle. The asthenosphere allows the plates to move and interact with each other due to its partially molten and more ductile nature compared to the lithosphere above it.
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.
Plates float on the semi-fluid asthenosphere layer, which is part of the upper mantle. This layer is under the lithosphere and allows the movement of the tectonic plates.