Ключевые слова: background, beautiful, beauty, bright, burns, closeup, color, concept, cooperation, coworker, education, energy, environment, experiment, fire, flora, garden, glass, grass, green, hand, heat, holding, ideas, leaf, lens, light, magnifying, natural, nature, outdoor, physics, plant, ray, rays, refraction, school, science, scientific experiment, smoke, spring, summer, sun, sunlight, sunrise, temperature, texture, transparent, wallpaper, yellow,