Diatoms are a type of microscopic algae found in oceans, rivers, and lakes. They are unique because their cell walls are made of silica, which forms intricate and beautiful patterns. These single-celled organisms play a crucial role in aquatic ecosystems, serving as a primary food source for many marine animals. Diatoms are also important for the environment because they produce oxygen through photosynthesis. They contribute significantly to global carbon cycling, helping to absorb carbon dioxide from the atmosphere. Their fossilized remains, known as diatomaceous earth, are used in various industries, including filtration and agriculture.