Source for the abundance of elements in the Earth's crust and in the sea:

CRC Handbook of Chemistry and Physics (D.R. Lide, Editor-in-Chief), 83rd edition (2002-2003), CRC Press, Boca Raton, FL, 2002, p.14-17.

The abundance of elements in the human body is based on an estimate by Robert A. Freitas Jr., Foresight Institute:


In the above source, estimated number of atoms of a particular chemical element in the lean 70 kg male human body is given; the weight expressed abundance here is calculated upon this estimate.

  UPDATED : 2004-12-12