Salt. <span>The six most abundant elements in ocean water are </span>chlorine<span>, </span>sodium<span>, </span>magnesium,sulfur<span>, </span>calcium<span>, and potassium. The salt halite, which is made of </span>sodium<span> and chloride ions, makes up more than 85% of the ocean's dissolved solids. Therefore, the </span><span>most abundant element in ocean water is salt.</span>
