Plastics break down into smaller microplastics in the sun. On land they collect more sun then when partially or totally submerged in the ocean. Rain then wash

Plastics break down into smaller microplastics in the sun. On land they collect more sun then when partially or totally submerged in the ocean. Rain then washes these microplastics from landfills into ground water. Plastic in the ocean is a huge problem, but it's not the only source of microplastics, and it might not even be the largest.