1·Sometimes visitors are able to walk out near the edge of this new black volcanic rock.
有时，游客们可以走到这些新形成的黑色的火山岩边缘。
2·The Sierra Nevada and the Cascade Mountains meet in Plumas County, and fall color against the grey backdrop of the volcanic rock that covers the region makes for dramatic views.
内华达山脉和喀斯喀特山脉相连接于普卢默斯县，秋季的色彩反衬着覆盖该地区火山岩的灰色背景。 造成了引人注目的景致。
3·Nicknamed "the bathtub ring", this discolouration comes from minerals that were once deposited on the volcanic rock by the Colorado River and have become visible as its level has dropped.
这条被俗称为“浴缸圈”的条纹形成于沉积在科罗拉多河旁火山岩中的矿物质，随着水位不断的下降如今显现了出来。
4·The dry land of the continents consists mostly of granite and other light silicate minerals, while the ocean floors are made up mostly of a dark, dense volcanic rock called basalt.
陆地地壳主要由花岗岩和其它轻质硅酸盐矿物构成，而海底则主要由黑色的高密度火山岩——玄武岩构成。
5·This volcanic rock, in the Champagne Pools on Fraser's northern shore, predates the rest of the island by millions of years.
弗雷泽岛北岸香槟池中的这块火山岩比岛上其它岩石出现早了数百万年。