volcanic ash

Mixed in with this dust there was also some volcanic ash, which contains minute zircon crystals.

The core contained four distinct layers of sediments that included volcanic ash that the team dated to between 234 million and 232 million years ago, matching the timing of the Carnian Pluvial Episode.

In a bulletin, the National Weather Service warned pilots that volcanic ash could be present in the atmosphere, a significant hazard to aviation.

Like many of the other remains at Pompeii, the two men in the villa lay in soft volcanic ash, which hardened around them and preserved the shape of their bodies long after their soft tissues had decayed.

The one-pound tub consists of just one ingredient, calcium bentonite clay, a pale-green powdered substance derived from volcanic ash.

Mexico City, which is built atop volcanic ash and clay, is particularly prone to quakes.

Loose lips, too much beer, and a cloud of volcanic ash swirl together in a perfect storm of circumstance too strange for fiction.

The fight for Iwo Jima in Part 8, co-directed by David Nutter and Jeremy Podeswa, is fought on black sands and volcanic ash.

Until now, Southeast Asia has been the place where volcanic ash and airline routes have intersected.

Well, just as human lungs can choke on the fine particulates in volcanic ash, so can jet engines.

This pertains to the deposit of volcanic ash which is so marked a feature of the accumulations of the river's banks.

Volcanoes make a very valuable kind of soil material, often called "volcanic ash."

Far and away lay only the uneven volcanic ash and the sagebrush.

It is volcanic ash, disintegrated basalt, this great fruit-country to the right of the range.

This, too, was a desolate brown slope until the effects of irrigation were felt on its rich volcanic ash soil.