which phrase describes a lava plateau? steep - sided mountain gently sloping mountain hardened magma in a…

Brief Explanations:

A lava plateau is formed from repeated lava - flows. It consists of volcanic material that has filled valleys and spread out, creating a relatively flat, elevated area. A steep - sided mountain is a typical volcano, not a lava plateau. A gently sloping mountain is more like a shield volcano. Hardened magma in a pipe is part of a volcanic neck, not a lava plateau.

Answer:

volcanic material in valleys