The water in your body flowed down the Nile, fell as monsoon rain onto India, and swirled around the Pacific. The carbon in the molecules of your cells was mined from the atmosphere by the plants we eat. The salt in your sweat and tears, the calcium of your bones, and the iron in your blood all eroded out of the rocks of Earth’s crust; and the sulphur of the protein in your hair and muscles was spewed out by volcanoes.

~ Lewis Dartnell, astrobiologist

Volcanic Glow – photo by PixieMe, bigstockphoto.com