{"thcode":2,"term":{"code":2269,"name":"microplastic contamination","parent":769,"scope":"Plastic particles less than 5 millimeters in diameter that come from a wide variety of sources, found in a variety of forms, including fibers, pellets\/beads, foams, films, fragments, and tire particles, and reach aquatic environments through diverse pathways."},"uf":[{"name":"microplastic pollution","usewith":false},{"name":"plastic microbeads","usewith":false}],"bt":[{"code":769,"name":"contamination and pollution","parent":1174,"scope":"Introduction of harmful substances into the environment by human action or natural processes."},{"code":1174,"name":"topics","parent":1,"scope":"Themes, subjects, and concerns for which USGS information resources are relevant."},{"code":1,"name":"Categories","parent":null,"scope":"Thematic terms for categorizing information resources.  This thesaurus is intended to support finding and understanding scientific information."}],"nt":[],"rt":[{"code":88,"name":"bioaccumulation","parent":310,"scope":"The biological sequestering of a substance at a higher concentration than that at which it occurs in the surrounding environment or medium.  Also, the process whereby a substance enters an organism through the gills, epithelial tissues, dietary, or other sources."}]}