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Re:Huge iceberg breaks off Antarctica by dkarl on Friday February 26, 2010 @01:54PM (#1153816)
very low-albedo, non-toxic powder

Like dirt?

Re:Huge iceberg breaks off Antarctica by Semiapies on Friday February 26, 2010 @01:58PM (#1153826)
Could be. Sand might not be dark enough, and that'd be a lot of humus to gather, but another sort might work...