Ключевые слова: background, barrel, beach, bio, blue, clean, cloud, clouds, coast, conduit, contaminate, contamination, cross, cross section, danger, dangerous, dirtiness, dirty, earth, ecological, ecology, environment, environmental, flow, holiday, holidays, impurity, industrial, industry, iron, landscape, long, marine, metal, natural, nature, nautical, naval, ocean, old, out, outflow, outlet, pipe, pollute, pollution, pollutions, problem, protection, rust, rusted, rusty, saltwater, sand, sea, seaside, section, side, sky, sludge, summer, symbol, technology, toxic, tube, urban, urbanisation, urbanization, vacation, vacations, water, world,