The rock has weathered away into soil.
岩石经雨蚀风化而变成泥土。
Mineral analysis of soil samples in the laboratory, the island's volcanic soil at least contain a so-called saprolite weathered rock.
在实验室对土壤样品进行矿物质分析，发现岛上的火山土壤至少含有一种称之为腐岩的风化岩石。
The softer rock has been weathered away into soil.
较软的岩石风化成了泥土。
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