Mini Ice Age Imminent, page-48

  1. 808 Posts.
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    Don't want to be too pedantic about this however......

    a mineral is a single solid formed from rock which does not burn at "room temperature".

    Coal is formed from organic substances.

    I don't know why it is classified as sedimentary rock when it is not a rock. Maybe to lump it in together with minerals to make mining exploration licences easier to get?
 
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