5079 x 3386 px | 43 x 28,7 cm | 16,9 x 11,3 inches | 300dpi
Altre informazioni:
Diatoms or siliceous phytoplankton have exquisitely formed silica shells or frustules They are among the most important aquatic organisms todayand are extremely abundant both in plankton and in sediments if marine and fresh water ecosystems Because they are photosynthetic they are an important food source for many marine organisms some may even be found in soils or on moist mosses Diatoms have an extensive fossil record going back to the cretaceous period Diatomite or diatomaceous are formed almost entirely of fossil diatoms These deposits are mined commercially as cleansers paints filtering agents and abrasives Many toothpastes contain fragments of fossil diatoms Fossil diatom assemblages provides important information and data of past environmental conditions
