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30% of the freshwater is in the ground in places like rivers, lakes, and freshwater storage. If the oil were to go into freshwater sources then humans' drinking water would be contaminated and non-drinkable. Acid rain is another result of the oil spill affecting the water cycle. Acid rain is a mixture of wet and dry deposited material from the atmosphere that contains higher amounts of nitric and sulfuric acids. When gases react in the atmosphere with water, oxygen, and other chemicals, acid rain forms.
Dilbit is harder to remove from waterways than the typical light crude oilâoften called conventional crudeâthat has historically been used as an energy source. While most conventional oils float on water, much of the dilbit sank beneath the surface. Submerged oil is significantly harder to clean up than floating oil: A large amount of oil remains in the riverbed near Marshall, and the cleanup is expected to continue through the end of 2012.