In such cases the largest fragments form what are called volcanic cinders, the smaller pieces, volcanic ashes, and the extremely small particles, volcanic dust.
All the winter's snow on the mountain could not have yielded such a flood, and Lyell considered that it melted older layers of ice which had been preserved under a covering of volcanic dust.
The rain, falling through the clouds of volcanic dust, brings it to the earth as liquid mud, which pours in thick streams down the sides of the mountain.
There is another way in which a great deal of volcanic dust is made; the lava is full of steam, which in its expansion tears the molten rock into atoms, often converting it into the finest dust.
Deep sea soundings show that the entire ocean bottom is covered more or less with the pulverized pumice and volcanic dust.
The ashes, or volcanic dust, is excessively minute, and in consequence readily penetrate crevices that are hardly visible.
Volcanic dust, however, cannot account for such a condition, for at present the air seems to be practically free from such dust for long periods.
Some, such as variations in the amount of volcanic dust in the higher air, have been considered in an earlier chapter.
Even hypotheses with something of proven worth, such as those of variations in volcanic dust and in atmospheric carbon dioxide, fail to account for localization.
But with the floods of lava came great explosions, like that of Krakatoa, by which the heavens were filled with volcanic dust.
The plateau itself is intersected with many deep, narrow canyons, having walls of lava, volcanic dust, or tufa, and red sandstone.
Most of her people lay fathoms deep in a tomb made in the twinkling of an eye by the collapse of their homes, and sealed forever under tons of boiling mud, avalanches of scoria and a hurricane of volcanic dust.
Finally, on the day of the great eruption, a vast column of volcanic dust, cinders, blocks of lava and asphyxiating gases rose thousands of feet into the air, spreading in all directions.
The above list will hopefully provide you with a few useful examples demonstrating the appropriate usage of "volcanic dust" in a variety of sentences. We hope that you will now be able to make sentences using this group of words.
