From Dust

A “massive amount of lava” isn’t clearly defined. When you see lava pouring out of a volcano, absorb it with and place it elsewhere with . Once you unlock Amplify the Breath, this process will speed up as you absorb much more. The levels with active volcanoes are The First Power, Tears of Stone, The Raging Earth, Emergence, and Movements. You can absorb and place lava over and over from the same volcano until you unlock this. Movements is chaotic enough with enough lava that you shouldn't need to do that though.