The finer the volcanic ash, the steeper and more conical is the mountain.
Of the latter is Posilipo, formed as I said out of volcanic ash.
The disintegrated lava or the volcanic ash are alike disagreeable.
Such is the case with a deposit of volcanic ash which has been discovered in the superficial strata on the plains.
I knew the land was rich—a pure marle, with lots of volcanic ash mixed with it, and that it would grow anything—with water.
It is often closely associated with volcanic ash, which is also used for abrasive purposes.
At the end of the score of houses that made the village street, the party struck a deep drift of the volcanic ash.
Some volcanoes are built up almost entirely of volcanic ash and its embedded blocks.
The volcanic ash which, unnoticed, had gathered thickly on the roof, had broken it in by its weight.
Enormous volumes of volcanic ash and dust were expelled and swept down the slopes as ash flows and avalanches.