Answer:
I think it might towering cumulonimbus or cumulonimbus
I thought about writing it for you but then i found this and thought i will give help but at the sometime allow you write the response you self
The rolling magma causes uneven currents in underneath the earths crust. Sort of similar to wind patterns in the sky but think of them as underground and in a much thicker fluid. Ocean currents might be a better analogy. Because of it being a much more viscous fluid, there is greater pressure buildup which can cause torsion, compression, expansion etc. when you bake a cake look how the dough underneath expands & the top crust cracks and stretches. Hope that helps.
The answer is 15 bc you multiply the coefficient but the subscript