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1926年地震学家古登堡就曾设想在地幔内部存在有规模很大的低密度物质。接着霍姆斯第一个提出地球内部因放射性热来驱动的对流机制,好像水烧热时上下对流一样。
In 1926, the seismologist Gutenberg had envisaged the existence of large-scale low-density material in the interior of the mantle. Then Holmes was the first one to propose a convection mechanism driven by radioactive heat inside the Earth, as if the water conveys up and down the convection.