Ключевые слова: abstract, background, blue, bubble, circle, clean, clear, cold, concept, conservation, danger, drink, drop, earth, eco, ecological, ecology, energy, environment, environmental, flood, flowing, fresh, global, globe, health, idea, life, liquid, nature, ocean, outer, planet, pollution, pure, reflection, ripple, sea, sink, space, sphere, splash, splashing, symbol, transparent, under, water, wave, wet, world,