Question

multiple-choice question
which of earths layers has plasticity and can move/flow over time?
outer core
lithosphere
inner core
asthenosphere

Explanation:

The asthenosphere is a layer of the Earth that is semi - molten. Due to its semi - molten state, it has plasticity. This plasticity allows it to flow over long periods of time. Plate tectonics theory suggests that the movement of tectonic plates (which are part of the lithosphere) is driven by the convection currents in the asthenosphere. The outer core is a liquid layer (composed mainly of iron and nickel) but it is not directly related to plate movement in terms of plasticity for plate - driving convection like the asthenosphere. The inner core is solid. The lithosphere is rigid (composed of the crust and the uppermost, rigid part of the mantle) and does not flow in the way required for the question.

Answer:

Asthenosphere