aa lava

[ä′ä ′lä·və]

(geology)

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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. Five appendixes contain the periodic table of elements, the geologic time scale, classification of species, solar system data, and evolution of life and the atmosphere.

Encyclopedia of Earth Science

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.

The smoke-breathing mountains of Hawaii: the volcanism that created the Hawaiian islands continues to put on some of the world's most amazing geological displays. Chartered geographer Andrew Lee travels to the Big Island to witness their power

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