lava flow

Lava tubes serve as underground pipelines , allowing molten rock to flow under and away from volcanoes.

岩溶洞像一个顶上管讲使熔融岩石从火山下端流走.

A hornito is a small rootless spatter cone that forms on the surface of a basaltic lava flow ( usually pahoehoe).

翻译成中文为：熔岩丘是形成于玄武岩熔岩流（通常为绳状熔岩）表面的小型无根溅出锥。

It has been 15 years since this part of Hawaii has seen lava flow like this.

这是十五年来这个夏威夷区域首次出现这样的熔岩流.

Lava balls grow when a small fragment of solidified lava rolls along the surface of an active flow and lava sticks or accretes to its surface.

当固化了的熔岩小碎块沿着活动的熔岩流表面滚动时，熔岩粘附到碎块表面上，熔岩球就长大了。

Lava flow on the south flank of South Sister . Photograph by Steve Mattox, August 1987.

译文:三姐妹山南峰南坡上的熔岩流. 史蒂夫·马托克斯在1987年8月拍摄.