Coastal & Marine Geology InfoBank

USGS CMG InfoBank: Minerals Formed By Biologic Processes


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Comment: 24:25 - 24:45 (00:20)

Source: Annenberg/CPB Resources - Earth Revealed - 12. Minerals: The Materials of Earth

Keywords: mineral, "biological activity", oyster, pearl, sponge, coral, "calcium carbonate", "sea water", precipitation, calcite, aragonite

Our transcription: Minerals also form by biologic processes as when an oyster makes a pearl.

In addition, sponges and corals make their shells out of calcium carbonate taken from seawater and precipitated as the minerals calcite or aragonite.

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Accessibility FOIA Privacy Policies and Notices
U.S. Department of the Interior \| U.S. Geological Survey URL: http://walrus.wr.usgs.gov/infobank/programs/html/school/moviepage/11.01.31.html Page Contact: InfoBank staff Page Last Modified: Wed Aug 27 06:15:02 PDT 2008 (wcs)