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