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Home to 111 different species of coral and more than 180 species of fish, the Elizabeth Reef is one of two protected atolls just north of Lord Howe Island.
Elizabeth Atoll, along with the Middleton Reef, are protected by the Australian government.
Although it is home to a few shipwrecks, only about 200 people have ever visited the island.
How can scientists use earth-observing satellites to study coral reefs?
What do the different ocean colors mean?