A reef is a big rock under the sea. 

46 words
🖼️ Images & Media (7)
Nusa Lembongan Reef.jpg
PamalicanAfterLiftOff.jpg
Reef.jpg
Vanatinai, Louisiade Archipelago.jpg
Bleached_coral.jpg
Great-Barrier-Reef-2018-Luka-Peternel.jpg
Fossil Reef Windley Key 1.jpg
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Content adapted from Wikipedia
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Readability: FK 13.5
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Vital Level 5