Typically, basaltic lava flows are glassy enough that in fact you would cut your hand. They can be extremely sharp.
特别的，这些玄武岩浆流玻璃状的可以锋利到切掉你的手。
Basaltic lava
原声例句
美国历史频道纪录片《宇宙》
Geologic | 地理地质类科普
They once generated enormous volumes of basaltic lava across Idaho’s Snake River Plain.
他们曾经 在爱达荷州的蛇河平原产生了大量的玄武岩熔岩。
英语百科
Mafic
Mafic is an adjective describing a silicate mineral or rock that is rich in magnesium and iron, and hence is a portmanteau of "magnesium" and "ferric". Most mafic minerals are dark in color, and common rock-forming mafic minerals include olivine, pyroxene, amphibole, and biotite. Common mafic rocks include basalt, dolerite and gabbro.
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