D?u m? hình thành t? xác sinh v?t bi?n ??i qua hàng tri?u n?m,?um?hìnhthànhvà???ckhaithácth?nàQuy t?c thay ng??i có nhi?u lo?i nh? n?ng, chua ho?c nh?, ng?t.

  D?u m? hình thành và ???c khai thác th? nào?

?? h?a: The Atlantic/Student Energy

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