The tiny micro-state known as Nauru has the richest phosphate reserves on the planet. These phosphate deposits are a function of

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      iron ore veins.
      large amounts of copper in the soil.
      massive amounts of bird guano.
      the limestone concentration in this geographic region.
asked Apr 11, 2013 in Social Studies by anonymous
    

1 Answer

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massive amounts of bird guano.
answered Apr 13, 2013 by CoolCat ~Expert~ (2,305 points)

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