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![Galapagos 2005 Expedition expl1161.jpg Galapagos 2005 Expedition](/sites/default/files/styles/max_1300x1300/https/s3.amazonaws.com/s3-east-testmedia-noaa.woc.noaa.gov/dam/Photos/legacy/pl23_expl1161.jpg?itok=Sx4fkSe6)
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Galapagos 2005 Expedition. The calcium carbonate shells of tiny sea creaturesliving at the sea surface fall to the seafloor as light-colored sediment when these organisms die. As time passes, this sediment accumulates on thesurfaces of the volcanic rocks far below. (Image credit: Image courtesy of UCSB, Univ. S. Carolina, NOAA, WHOI.)