Ключевые слова: abstract, background, bacteria, ball, biology, bokeh, concept, conceptual, course, crystal, design, earth, eco, ecology, educational, environment, environmental, geography, glass, global, globe, grass, green, jag, leaf, magnifier, map, microrganisme, microscope, natural, nature, organic, plant, protect, recycle, science, shine, space, sphere, study, sunlight, swamp, symbol, transparent, water, world,