All major tectonic features, including hot spots, island chains, seamounts, and abyssal plains are represented and rock types include drowned coral reef rocks ... to get a greater understanding about ...

Unlike coral reefs that consist of numerous colonies ... From a bird's-eye view, the coral resembles a massive, wrinkled brown rock formation, so much so that some expedition members initially ...

Darwin also proposed a theory of how isolated rings of coral reefs, known as atolls, formed. He suggested that they originally ... through an atoll in the Pacific Ocean and found volcanic rocks ...

The southern reaches of the archipelago are where Palau's most characteristic geological features rise in strange formations ... Suddenly, the coral reef is illuminated; this is the Palauan ...

Many sites are simply marked by yellow rocks located just off the shoreline. johnandersonphoto/Getty Images Caribbean coral ...

Declared a UNESCO World Heritage Site in 1996 – along with six other areas surrounding Belize's barrier reef ... and rock formations. You'll likely spot marine life lining the coral wall ...

Corals helped Darwin refine his ideas about evolution. His first scientific book after returning from the voyage of the Beagle was an account of the formation of coral reefs.

Second, while parrotfish help reefs to grow by keeping them clean, they also can cause gradual erosion of reef structures. Some parrotfish species graze by biting off chunks of coral, especially ...