The larger plastic pieces turn to micro over time. "Secondary plastics are small pieces of plastic derived from the breakdown of larger plastic debris, both at

The larger plastic pieces turn to micro over time. "Secondary plastics are small pieces of plastic derived from the breakdown of larger plastic debris, both at sea and on land. Over time, a culmination of physical, biological, and chemphotodegradation, including photodegradation caused by sunlight exposure, can reduce the structural integrity of plastic debris to a size that is eventually undetectable to the naked eye"[1] [1] https://en.wikipedia.org/wiki/Microplastics https://en.wikipedia.org/wiki/Microplastics