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The concretion of minerals around the fossil preserved even the finest ridges for millions of years.
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The concretion of minerals around the fossil preserved even the finest ridges for millions of years.
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Related words
concretion
Noun
countable
uncountable
Japanese Meaning
凝集・固結して一塊になる過程 / 凝集や固結によって形成された固体の塊
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