Our Planet, the incredible new documentary series narrated by Sir David Attenborough, explores the beauty of life on Earth and highlights the threats that we pose to it. In the coastal seas episode, ...

In and along the cliff coasts, the following may be discerned (Fig. 1): a. A ridge consisting of boulders of coral limestone, thrown up by the waves during extremely heavy wave action. It is found ...

As these polyps grow and die they lay the limestone foundation for civilisations and superstructures so large that they can be seen from space. Coral reef cities never sleep, they are constantly ...

They left behind petroglyphs, which you can still see today on the marine coral limestone walls. The caves later provided shelter to escaped slaves, who lived in them for months at a time.