Not all bioplastics are biodegradable nor biodegrade more readily than commodity fossil-fuel derived plastics. It does not readily biodegrade, adsorb, or volatilize. However, bioplastics in soil environments need higher temperatures and a longer time to biodegrade. Several enzymes biodegrade 2-methyhlnaphthalene in anaerobic conditions. Plastics accumulate because they typically do not biodegrade as many other substances do. Plastics accumulate because they don't biodegrade in the way many other substances do. Like many plastics, it is difficult to biodegrade. Silica gel is not expected to biodegrade in either water or soil. Natural coffins are made from materials that readily biodegrade. Waste polystyrene takes hundreds of years to biodegrade and is resistant to photo-oxidation. At that point, organic compounds naturally biodegrade. The gels and their dyes are designed to biodegrade naturally. Plastic particles don't biodegrade or break down and instead just fragment into smaller pieces. Oil-eating bacteria biodegrade oil that has escaped to the surface. A paper cup may biodegrade faster than a Styrofoam cup or a plastic cup.