Magnesium is a mineral found in a wide variety of foods. Inside of our bodies we mostly find magnesium in our bones (60-65%), in our muscles (25%) and in other cell types and body fluids. Magnesium cannot be made in our body like all minerals, which is why we need to take it in through magnesium-rich foods.
The Brinell hardness number (HB) is the load divided by the surface area of the indentation. The diameter of the impression is measured with a microscope with a superimposed scale. The Brinell Hardness Number is computed from the equation: P is the applied load of 3000, 1500, or 500kg.
However, brine shrimp have no defense against predation, so can best thrive in conditions in which their predators cannot, such as high salinity and temperature. In Brine Shrimp 1: Hatching Brine Shrimp, students will design a test to determine the optimum salinity for hatching brine shrimp. In Brine Shrimp 2: Brine Shrimp Survival, students will raise these brine shrimp, designing an artificial environment in which they can survive.