aa lava

aa lava

[ä′ä ′lä·və]
(geology)
References in periodicals archive ?
Specific topics include strike-slip fault, terminal moraine, tsunami, weathering, Yellowstone National Park, mass wasting, Kaapvaal craton, ichnofossils, greenstone belts, geodesy, El Nino, desalination, carbon cycle, and aa lava.
And apart from the noxious, indeed potentially fatal, sulphurous gases and the risk of falling on the razor-sharp aa lava flows or collapsing through into veins of molten rock, such access is comparatively safe.
According to Cathey Tarleton, the Mauna Kea's de facto historian, Jones crushed some of the porous aa lava (meaning rough lava in Hawaiian) with a hammer and determined that it would make a rich soil base.