Ключевые слова: blue, boy, business, care, careful, caucasian, child, childhood, classroom, concept, conserve, continent, country, development, earth, ecology, education, elementary, environment, explore, fragile, fragility, future, geography, global, globe, hand, hands, hold, holding, human, international, kid, land, little, map, peace, person, planet, preservation, protection, responsibility, safety, school, security, sphere, symbol, travel, world, worldwide,