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aa

B2 noun

Các nghĩa

  1. dung nham aa

    A form of lava flow associated with Hawaiian-type volcanoes, consisting of basaltic rock, usually dark-colored with a jagged and loose, clinkery surface. Compare pahoehoe.

    uncountable

    We...saw ‘pahoihoi’ or solid lava forming, and also ‘aa’ or clinkers.