They build a food plate and learn: 1  the names and colors of the food groups. 2  how to categorize foods by food group. 3  how many servings they need from each food group every day. 4  ways to be active 60 minutes per day.
Many of the dissolved ions are used by organisms in the ocean and are removed from the water. Others are not used up and are left for long periods of time where their concentrations increase over time. The two ions that are present most often in seawater are chloride and sodium.These two make up over 90% of all dissolved ions in seawater. By the way, the concentration of salt in seawater (salinity) is about 35 parts per thousand.In other words, about 35 of 1,000 (3.5%) of the weight of seawater comes from the dissolved salts; in a cubic mile of seawater the weight of the salt, as sodium chloride, would be about 120 million tons.any of the dissolved ions are used by organisms in the ocean and are removed from the water. Others are not used up and are left for long periods of time where their concentrations increase over time. The two ions that are present most often in seawater are chloride and sodium.
Chloride. A chloride ion (Cl-) is a negatively charged ion that forms when the element chlorine picks up an extra electron. Chloride ions make up approximately 55 percent of seawater's salinity.g2+, or a magnesium molecule that has gained two extra electrons, creates approximately 3.7 percent of an ocean's salinity. Calcium ions, or Ca2+, are calcium molecules that have gained two extra electrons. Calcium ions make up about 1.2 percent of the salinity of seawater.