Microplastics is small pieces of plastic. The definition varies but the name comes from its size being measured in micrometers, sometimes in the hundreds or even low thousands but still measured in micrometers. In general plastic do not break down in nature, however it does get worn down over time. You might have experienced this when wearing clothing and your navel fills up with lint. If your clothes contain plastic that is the microplastics from the fibers getting torn out of the clothes. In your clothes dryer lint trap there is a lot of microplastics collected. But for example the microplastics from your washing machine gets flushed down the drain and end up in the ocean.
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