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    October 10

    我是宇宙中的颗尘埃

    昨天向老婆请教关于岩石分类的问题,于是她和我说分为沉积岩,侵入岩和变质岩。

    沉积岩分布最广,占了70%,像煤炭之类的都是沉积岩,
    然后比如沙子沉积成砂岩,小石头沉积成砾岩,泥土就沉积成页岩。

    侵入岩又分为地表侵入岩和地下侵入岩,岩浆喷出地表就成了浮石等等,岩浆侵入地下就形成了花岗岩……

    于是我又想起探索发现里说的小行星撞击地球的几率,大约100万年一次。
    所以在人类文明的几千年里,几率很小,但是如果放到生物进化的上亿年历史来看就是必然的了。

    然后我很沮丧。
    我只是茫茫宇宙中的一颗尘埃。
    可是连尘埃都还要上班。

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    轩 轩wrote:
    老哥~~啥时候给咱家族制造出第一颗小尘埃呀?哈哈
    Oct. 11

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