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1. The unstable lava delta is constantly changing as hardened lava piles up on the slope of the volcano that extends to the ocean floor.

2. Scientists say the ocean floor contains rich deposits of a range of potentially valuable minerals, but the extreme depths pose obstacles to gathering them.

3. Currents could also have scattered debris far along the ocean floor, he said.

4. Scientists scouring the ocean floor to study the nature of tsunamis discovered a massive underwater volcano off Indonesia's western coast.

5. He said research into microscopic organisms on the smoky ocean floor could shed light on the origins of life.

6. Japan's Coast Guard said it would launch a study of the ocean floor off Kashiwazaki starting Friday to better map fault lines in the area.

7. Geological and Nuclear Sciences seismologist Warwick Smith said the quake happened in an area of the ocean floor where two tectonic plates meet.

8. Both are attached to a tether to the ocean floor about 4 km below.

9. The area is famous for its abalone and sea cucumber farms, all on the ocean floor.

10. An ocean floor observation platform is being jointly built by the United States and Canada in the northeast region of the Pacific.