| 1 | Coral is formed by certain types of polyp. | |
| 2 | But mushroom corals, such as this one, are loners. | |
| 3 | A diver swims over a bed of large, round table coral. | |
| 4 | Using the coral data the scientists found three previous sets of large earthquakes. | |
| 5 | Because the corals are alive, they provide a continuous supply of material. |
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