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单词 age of the earth
释义 age of the earth
The time since the earth emerged as a planet of the sun, estimated by dating techniques to be about 4.6 × 109 years. The oldest known rocks on earth are estimated by their radioactive age to be about 3.5 × 109 years old. The earth is older than this because of the long time it took to cool. An estimate for the cooling time is included in the estimate for the age of the earth
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更新时间:2025/6/22 23:45:54