As salt is a mineral rather than from an animal source, all salt is kosher - as are all plants, provided they've been checked for insects which are most definitely notkosher.
The kosher salt you see in shops is used to soak up all traces of blood from meat. Jews are strictly forbidden from consuming blood, and so if meat is to be kosher it must have all blood removed even if it has been produced from an animal killed in the kosher way - as such, kosher salt is sometimes (and more correctly) known as koshering salt. There is no difference between kosher salt and sea salt, other than that kosher salt is likely to have been produced by a Jewish company and as such will have a label proclaiming it to be parve or pareve - ie; it is not made from an animal, contains no ingredients from an animal and as such is neutral, neither kosher nor treif(non-kosher).
To be able to display a kosher or parve label, a food manufacturer's premises must be regularly checked by highly expert rabbis to ensure that the food is in fact as it is claimed, and the rabbi will need to be paid for this - that's why kosher salt tends to cost a little more than sea salt, which in turn explains why some chefs and gastronomers believe it is in some way superior.
Iodized salt contains small traces of iodine, another chemical element, in the salt. It has been added primarily to avoid problems of iodine deficiency in large populations.
Kosher salt is the same as table salt. Sea salt has far less sodium.
Almost all salt is kosher by default. The only issue would be if non-kosher additives such as flavourings were added to the salt. Sea salt is healthier than traditional table salt as the sodium level in sea salt is far lower.
Sea salt is a mineral and so long as anything that is non-kosher is not added to the dry salt crystals the salt is kosher. To say that sea salt is not kosher because non-kosher aquatic life lives in the ocean would be the same as saying that all fruits and vegetables are not kosher because they've come in contact with bugs.
May be
It is possible.
it's an opinion, you tell me
Not exactly, but for many purposes it's close enough. Kosher salt is salt that has large coarse grains, and no additives.
Kosher salt has the exact same composition as table salt. Some salt, including sea salt, has small amounts of dextrose added to prevent caking and to maintain quality. You'd have to check the packaging for that.
Kosher salt is no different to ordinary sea salt, despite the common belief amongst some gentiles (non-Jews) that to become kosher food must be blessed in some way.Amongst the many laws related to which foods are kosher and which are treif (not kosher) is one stating that Jews must not consume blood. Once an animal has been killed according to shechita - the laws governing animal slaughter - all blood must be removed from the meat which is done by soaking it up with kosher salt.Some people refer to it as koshering salt, which would be a slightly more accurate term.
Yes
Only the granulation of the salt has some influence.
Yes. The substance itself is intrinsically kosher. The only question might arise if the sea salt is processed or packaged on machinery, or in a facility, where it could come in contact with non-kosher ingredients of other products.
2 tsp of table salt. The only difference between the two is the size of the granules.