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sediment |
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At that time, the ice sheet that covered much of northeastern North America was retreating northward past Lake Superior, and rivers flowing into the lake were carrying distinctive reddish sediments that had eroded from nearby bedrock. Sediments in Sydney Harbour, Nova Scotia, are highly contaminated by polynuclear aromatic hydrocarbons (PAHs), polychlorinated biphenyls (PCBs), and heavy metals. The Ministry of Northern Development and Mines has been analyzing lake sediments for platinum group elements (PGEs) with great success," said OGS geoscientist Richard Dyer. |
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