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Aug 2, 2013 at 5:06 comment added Lèse majesté "Earth" is not a homogenous substance. A typical sample of soil generally contains 45% minerals, 25% water, 25% gases, and 5% organic matter. Many of the minerals in the typical soil sample are in fact metals; common ones include: iron, aluminum, magnesium, gallium, zinc, silver, etc., but other rare earth metals like gold and platinum are also found in soil in trace amounts.
S Oct 8, 2012 at 9:51 review Late answers
Oct 8, 2012 at 11:24
S Oct 8, 2012 at 9:51 review First posts
Oct 8, 2012 at 10:03
Oct 8, 2012 at 9:47 history answered jesse CC BY-SA 3.0