References:
www.webelements.com/calcium/
www.chemistry.about.com/ad/elementfacts/a/calcium/htm
www.honorschemistrypca.wikispaces.com
www.factsaboutchemistry.blogspot.com
www.muchmoreofhim.blogspot.com
www.manbir.online.com
www.crack.seismo.unr.edu
www.drpeterzwier.com
www.chemicalelements.com
http://chemistry.about.com/od/elementfacts/a/10-calcium-facts.htm
http://smartstat.net/17-interesting-facts-about-calcium/
www.chemistry.about.com/ad/elementfacts/a/calcium/htm
www.honorschemistrypca.wikispaces.com
www.factsaboutchemistry.blogspot.com
www.muchmoreofhim.blogspot.com
www.manbir.online.com
www.crack.seismo.unr.edu
www.drpeterzwier.com
www.chemicalelements.com
http://chemistry.about.com/od/elementfacts/a/10-calcium-facts.htm
http://smartstat.net/17-interesting-facts-about-calcium/