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Sea-floor spreading.

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View Resource Huge New Hydrothermal Vent System Found on Seafloor

A new hydrothermal vent field, which scientists have dubbed "The Lost City," was discovered unexpectedly earlier this month on an undersea mountain at 30 degrees North on the Mid-Atlantic Ridge. This news item from the National Science Foundation discusses the discovery made by a team of researchers from Scripps Institution of Oceanography, Duke University, and the University of Washington during...

https://www.nsf.gov/publications/pub_summ.jsp?ods_key=pr0093
View Resource Petrological Database of the Ocean Floor

Carried by Lamont-Doherty Earth Observatory (LDEO) of Columbia University, the Petrological Database of the Ocean Floor is a National Science Foundation (NSF) funded research project that includes over 30,000 samples and over 700,000 chemical values from oceanic stations throughout the world. Samples can be searched by location, expedition name, ship name, sample characteristics, reference, or by...

http://www.earthchem.org/petdb
View Resource Life at Hydrothermal Vents

The first Web site is a NOVA Online Adventure from PBS (1). Into the Abyss decribes the "pitch darkness, poison gas, heavy metals, extreme acidity, and enormous pressure" found at hydrothermal vents, and offers a look at bizarre and fascinating creatures found in this environment. The next Web site from Exploring Earth, an online earth sciences text book, contains video clips taken during research...

https://scout.wisc.edu/report/nsdl/ls/2002/1115