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Marine Microplastics Map Portal Fact Sheet

Microplastics are plastics that are smaller than 5 mm (about the size of a sesame seed) that primarily come from plastic materials such as bottles, bags, clothes, and cosmetics. Most microplastics start on land and are carried by rivers and wind to the ocean. Once plastics enter the ocean, wave action and sunlight can weaken large items and break them into smaller pieces.