In both cases , there was vaporous masses , opaque , filled with powdery materials , in a mass of cloud , that descended the flanks of the mountains along the surface of the soil .
That killed the plants and animals .
In both cases , there was vaporous masses , opaque , filled with powdery materials , in a mass of cloud , that descended the flanks of the mountains along the surface of the soil , and that killed the plants and animals .