The total lithium content of seawater is very large and is estimated as 230 billion tonnes ... At 20 mg lithium per kg of Earth's crust, lithium is the 25th mos

The total lithium content of seawater is very large and is estimated as 230 billion tonnes ... At 20 mg lithium per kg of Earth's crust, lithium is the 25th most abundant element. http://en.wikipedia.org/wiki/Lithium#Terrestrial http://en.wikipedia.org/wiki/Lithium#Terrestrial