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Ocean floor geysers warm flowing sea water
Date:9/22/2008

ort some of the life forms we see on the sea floor," said Stein. Her best guess as to why the water flows so rapidly is that it accelerates off nearby sea mounts and follows a well-connected network of cracks beneath the sea floor.

The earth scientists dropped probes from ships down to the pitch-dark ocean floor to collect temperature and heat-flow data to form images of what is happening in this area of the ocean, with water flowing down into rock, heating up and remixing below the floor sediment, and then escaping above the sea floor.

Only in recent decades have earth scientists discovered such life forms as bacteria, clams and tubeworm species living near the hot water discharges along the mid-ocean volcanic ridges. The rather flat undersea areas which Stein and her colleagues studied were thought to be lifeless, but the nutrient-enhanced warm water flows they discovered suggests this area too may be capable of supporting life.

"The sea floor may not be quite as much of a desert even as we thought maybe 20 or 10 years ago, but rather there may be a lot of locations similar to this well-studied area in terms of the water flow where there's a lot more biological activity," she said.

The earth scientists hope to do follow-up studies to add details to their findings, and see if they can find other regions comparable to the one off Costa Rica.

"We're only beginning to really understand the interplay of the water flow and the nature of the ecosystem on the sea floor," said Stein. "I think as we move away from the ridge crests, understand what's going in the overall ocean, we'll have a better understanding of how life is distributed and affects the oceans and our planet."


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Contact: Paul Francuch
francuch@uic.edu
312-996-3457
University of Illinois at Chicago
Source:Eurekalert

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