熔岩平原lava field)是一種平原地貌。火山噴發後,熔岩會向地勢較低的區域流動,在凝固後,平整的熔岩表面凝固成固態,就形成了熔岩平原。熔岩平原的一個特徵是地表會有許多類似於水面波紋的起伏[1]。除地球表面存在熔岩平原外,月球火星地表也有熔岩平原的分布,常說的「月海」就是月球表面的熔岩平原[2][3]

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冰島境內的一處熔岩平原

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