Create a landscape educational diagram for middle-school students that explains three stages of coral bleaching and recovery. Arrange a shallow-water cutaway from left to right, showing the same branching coral colony in a consistent shape across all stages. Stage one is healthy, with natural brown-green color and visible symbiotic algae. Stage two is heat-stressed and bleached, visibly pale but still structurally intact rather than dead. Stage three is recovering after environmental stress is reduced, with gradual return of color and a few small reef fish. Use only three large, clean English labels rendered exactly once: "Healthy", "Bleached", and "Recovering". Connect the stages with simple arrows indicating time; avoid paragraphs or dense legends. Use friendly, scientifically grounded illustration, shallow blue water, generous whitespace, consistent scale, and clear visual comparison. Keep species forms plausible and the learning objective immediately readable. Do not depict bleached coral as a bare skeleton, do not invent alarming claims, and include no brands, no decorative clutter, no watermark, and no garbled text.