Currents are caused by tempenture and density differences

Dis the answer you perception is how you see the world 

Ibelieve it's the pacific islands 

There are no put the options so we can assist you ! put it on then i'll answer it ! did you not put the options on intentionally by any chance?

If a particular resource is not useful or needed then the price would be considerably low. once that resource is needed the price or value will raise depending on how useful or needed it is especially if the resource is low in quantity, the consumers would pay whatever they have to, to get that material.