Wudaoliang group is grayish - white, yellow - grey, dark - grey ash rock, which interbeded with the conglomerate, sandstone, a little amount mudstone, oil shale with unconsolidated sand mud rock.

五道梁群以灰白色、灰黄色灰岩为主，含有砾岩、砂岩，夹有少量泥岩、油页岩和未固结砂泥沉积。

youdao

The current stratovolcano-a cone-shaped volcano built from successive layers of thick lava flows and eruption products like ash and rock fragments-is built on top of an older stratovolcano.

这个层状火山是由稠密的熔岩流以及火山灰和岩石碎片等喷发物所形成的连续层堆积而成的锥形火山，它位于一个更老的层状火山之上。

youdao

Tephra is any fragmented material produced by a volcanic eruption, be it ash or rock.

无论是灰烬还是岩石，所有因火山爆发而形成的碎片状物质都称作火山灰。

youdao

After thousands of years the ash became a soft rock.

VOA: special.2010.07.05

The ash clouds include particles of rock, glass and sand that can get into an aircraft's engine and cause it to stall.

VOA: standard.2010.04.17

The eruption also engulfed a small Maori village, Te Wairoa, in mud, ash and rock.

BBC: Lakeside treks in a geothermal land

The volcano strikes an ominous presence on the horizon - one of countless sleeping giants in Iceland that might one day stir, sending torrents of fire, rock and ash raining down.

BBC: An Icelandic journey to the centre of the earth

And the film's most deluxe monster is Kronos (father of Zeus, Hades and Poseidon), who, after being overthrown and imprisoned, has now risen up in the form of a really, really gigantic giant made entirely of volcanic rock and ash, with humungous arms that disintegrate and reconstitute themselves as they throw off fiery streams of lava.

CNN: SHARE THIS