The sample consisted of pebbles of hardened sediment that had once been soft, deep-sea mud, as well as granules of gypsum and fragments of volcanicrock.
这一样本包括曾经柔软的的硬化沉积物的卵石、深海淤泥以及石膏颗粒和火山岩碎片。
2
It's built on volcanicrock and ash.
该城建立在火成岩与火山灰上。
3
Sometimes visitors are able to walk out near the edge of this new black volcanicrock.