Only about 25 percent of the oil was recovered, burned, or skimmed. Then another 25 percent of the oil evaporated or dissolved. Meanwhile, 24 percent of the oil remains dispersed in the water, while another 26 percent of the oil falls into a catch-all "residual" category. That includes oil sheen on the surface, weathered tar balls, oil that has been collected from shorelines, as well as oil that has seeped into sand and sediments, where under the right conditions it can have long-lasting ecological effects. (Spotts., …show more content…
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