Ключевые слова: abstract, blackboard, building, care, chalk, chalkboard, concept, continent, country, drawing, drawn, earth, eco, ecology, environment, geography, global, globe, green, hand, home, house, idea, illustration, land, learning, letter, life, live, mainland, map, nature, ocean, planet, property, protection, residential, roof, save, school, sketch, sphere, studying, text, travel, word, world,