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MissPhiladelphia
After thorough researching, the mine tailings must be stored and disposed of carefully because they have lots of chemical and various toxic materials. They can also leach to the aquifers. The correct answer to the following given statement above is they have chemicals which are dangerous.

Answer:

Tailings must be stored and disposed of carefully because they hold various toxic chemicals and materials. The chemicals that are in tailings is oilsands can contain naphthenic acids, polycyclic aromatic hydrocarbons, phenolic compounds, ammonia, lead, mercury, and other metals. These chemicals can cause erosion and sinkholes, and contaminating soil and water supplies.

Explanation:

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