Final answer:
The layers of the earth that can move internally or flow are the mantle and the asthenosphere due to forces like convection currents.
Step-by-step explanation:
The layers of the earth that can move internally or flow are the mantle and the asthenosphere. The mantle is a semi-solid layer located between the Earth's core and crust, and it experiences slow, creeping movement due to convection currents. The asthenosphere, which is part of the upper mantle, is a plastic-like layer where the lithospheric plates float and move.
Learn more about Layers of the Earth