Amon the following, which has the lowest levels of dissolved iron? a. Atlantic Ocean b. Indian Ocean c. Pacific Ocean d. The temperate regions of all oceans Solution The correct option is Pacific ocean because of the low dust sedimentation and iron is readily soluble in low oxygen regions and the continental margins. It was believed that iron remained in the localized areas but didn\'t contribute to the overall iron content of the ocean. As it is explained by Nielsen, as soon as the iron-rich fluids hit the seawater with high oxygen content, the iron gets dumped out and is not contributed to the overall amount of the dissolved iron..