What is pH. pH is a measure of the hydorgen ion concentration of a solution. Solutions with a high concentration of hydrogen ions have a low pH and solutions with a low concentrations of H+ ions have a high pH. This may seem like a confusion way to express these reationships, and it is, until you understand what pH stands for.
Because they depend on sunlight for photosynthesis, diatoms generally live in the upper 200 meters of oceans and bodies of fresh water. Some species of diatoms simply float in the water currents near the surface.Others attach themselves to larger floating objects or to the sea floor.ecause they depend on sunlight for photosynthesis, diatoms generally live in the upper 200 meters of oceans and bodies of fresh water. Some species of diatoms simply float in the water currents near the surface.
Skeletonema costatum. Diatoms are unique forms of algae that grow a silica shell that is preserved in underwater sediments after they die. The diatom shell, called a frustule, is different for each species, so you can identify them through a microscope.By looking at the fossil frustules in the layers of sediment, you can see which kind of diatoms lived when that layer was deposited.he diatom shell, called a frustule, is different for each species, so you can identify them through a microscope. By looking at the fossil frustules in the layers of sediment, you can see which kind of diatoms lived when that layer was deposited.