Vortex
Plastic ends up in a giant vortex (gyre) of rubbish in the sea. The Great Pacific garbage patch, with 1/3 of all plastic in the oceans, is twice as big as the UK. There are 4 other gyres: in the S Pacific, N Atlantic, S Atlantic and Indian Ocean
Guessed the Word? Series 17 (1/7) [pic: geralt]