Ключевые слова: abstract, africa, america, asia, background, blackboard, blue, book, classroom, color, concept, conceptual, continental, desk, earth, education, environment, global, globe, green, gripping, help, hold, hope, image, isolated, map, middle, nature, nobody, object, ocean, planet, protect, protection, recycle, reflection, save, school, sea, shape, sphere, stack, textbook, touch, universe, warming, water, white, world,