Iron is an essential nutrient for all organisms. Marine phytoplankton must extract iron from seawater. The iron produced in seawater is usually very small, so for the vast ocean areas, the limitation of iron limits the growth of phytoplankton. The iron in seawater mainly comes from suspended matter in rivers. However, most of these suspended iron-containing substances are deposited in offshore areas. Therefore, the transportation of wind and dust has become the main form of iron replenishment in the ocean far away from the continent, especially for areas with less iron (such as high latitude seas), this kind of replenishment has a great role in promoting the growth of phytoplankton.
tent with the original text?
The iron in the deep sea area mainly exists in the form of river suspended matter.