Ключевые слова: active, activity, adult caucasian, adventure hike, autumn september, backpack, boy child, casual clothes, childhood, children, classmate, curious girl, day, discovering environment, discussing talking, ecology lesson, education, explorer, female, green tree, group people, happy schoolboy, hiking camping, holding notebook, kid outside, learn study, listening, making notes, nature forest, outdoor, positive cheerful, school kids, schoolchild pupil, schoolchildren exploring, schoolgirl, schoolkid, scout, sitting grass, smile happiness, smiling, studying together, sunlight summer, sunny weather, teaching explaining, warm hat, woman teacher, wood, woodland, writing down, young,