What is the relationship between salt and iodine? I have seen and read some comments from the post: What is the difference between sea salt and regular table salt?

My questions are. 


Does Rock or Natural salt contain iodine?
Does Table Salt contain Iodine or has Iodine been removed?
Does "Iodised" / "Iodized" table salt have Iodine added?


I have been having a discussion with a friend on whether Iodine is added to salt.
Iodine is commonly added to table salt, hence the term "Iodized".

This is purely a public health issue, much like fluoridation of water.   The human body needs small quantities of Iodine for good health, and salt was the method chosen to give it to us.  Just as fluoride is added to water, and Vitamin D is added to milk.  It actually has nothing to do with the product, it's just a convenient carrier.

See: http://en.wikipedia.org/wiki/Iodised_salt  for more information.