They are formed in the ocean.
By some rocks and plants.
Put on for hundreds of years.
in oceans
coral reefs were formed by the calcium of skeletons
coral reefs are formed from mineral.
the coaral tree
Sediments turn into coral reefs when coral colonies are formed over them, a process that can take thousands of years.
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submerged islands
A Cay is formed when Ocean currents loose sediments as they pass over reefs Gradually layers of deposited sediment build up on the surface of the reefs
a small, low-elevation, sandy island formed on the surface of coral reefs
a low elavation of land formed from the surface of coral reefs
A low island is typically formed by the buildup of coral reefs or by volcanic activity. Coral atolls are formed by the growth of coral reefs on the rim of submerged volcanic islands. Volcanic low islands are created by the eruption of underwater volcanoes, with the accumulated lava and ash forming the island over time.
You think of course to coral reefs.