What will become of the massive volcanic pumice rafts spreading throughout the Pacific Ocean?

Last week, we told you about a 7,500-square-mile raft of pumice discovered floating in the Pacific Ocean, but more recent observations by NASA reveal that chunks of the volcanic rock have since spread over an area of 100,000 square miles. So people are starting to wonder: What will become of the pumice? »8/22/12 7:40pm8/22/12 7:40pm