Ключевые слова: art, background, black, center, composition, contour, core, cross, crust, cut, cutaway, earth, education, environment, geography, geology, globe, icon, illustration, inner, inside, isolated, lava, layer, layered, layers, line, linear, lineart, lithosphere, mantle, map, model, nature, ocean, outer, outline, part, planet, research, science, section, solid, space, sphere, structure, study, white, world,