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Marine biologists have [unearthed / earthed] a spectacular coral reef off the coast of Tahiti in the South Pacific. The 3km-long reef [lays / lies] at a depth of 30 metres. The scientists believe the [disarray / array] of corals and ocean vegetation contains previously [undiscovered / discovery] marine species. They have already found hundreds of rose-shaped coral, some of [that / which] measure over two metres in diameter. Deep-sea diver Alexis Rosenfeld said he was [stunning / stunned] when he came across the reef. He wrote: "It was [magical / magician] to witness giant, beautiful rose corals which stretch for as [farther / far] as the eye can see. It was like a work of art." Scientist Laetitia Hedouin said: "It's a very healthy reef. [In / On] the middle of the biodiversity crisis, this is very [well / good] news."

Scientists say the [vocation / location] of the Tahiti reef means it is [in / on] pristine condition. Most of the world's reefs are in [warmer / warmth] waters. This makes them prone to the bleaching effects of global warming. Tahiti's reef is deep [plenty / enough] to protect it from bleaching. There is still [suffice / sufficient] sunlight at 30 metres for coral to grow and reproduce. UNESCO said: "We think that [deeper / deepen] reefs may be better protected from global warming." It [beliefs / believes] the Tahiti reef is "one of the most extensive healthy coral reefs [on / in] record". It added that more mapping of the deep ocean needs to be [overtaken / undertaken] . It said: "We know more about the surface of the Moon or the [top / surface] of Mars than the deeper part of the ocean."

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