160ma是幾年? - 地球科學討論
By Sarah
at 2007-10-05T13:55
at 2007-10-05T13:55
Table of Contents
買到一個菊石化石,上面寫160ma
不就是16億年前了嗎?...
可是菊石不是4億年前才出現的嗎..
是我算錯了?...應該是1.6億年吧
ma後面得補多少個0呢?
謝謝^^
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地球科學
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By Connor
at 2007-10-08T18:04
at 2007-10-08T18:04
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at 2007-10-11T22:13
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at 2007-10-15T02:23
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at 2007-10-18T06:32
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at 2007-10-21T10:41
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