Background: Algae are responsible for converting carbon dioxide into oxygen. However more than 20% of the world\\\'s oceans lack algae growth. The essential nutrient that is lacking in the algae-deficient surface waters is iron. However this iron must be (i) on the surface so that the algae can convert carbon dioxide to oxygen via photosynthesis and (ii) biologically available so that algae can use it. Technology Description: This technology describes the composition of and the method of production for water-buoyant particles that contain bioavailable iron.