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The researchers lowered long pipes to the seafloor in a blue hole to extract cores of sediments that accumulate on the bottom over time. Sediments farther down in the core were deposited further back in time. The cores are cut into shorter sections (this is 2 of 9) and then split in half. Scientist can find layers of material that were deposited by hurricanes in the past. They can date material in the layers to determine the years when the hurricanes passed through the region.

(Lizzie Wallace, Woods Hole Oceanographic Institution) [ Hide caption ]

Long Island Blue Hole Core

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