Acid precipitation can dissolve aluminum from soil. As aluminum is dissolved, it can flow into lakes and contaminate the water. High concentrations of aluminum in lakes is fatal to many forms of aquatic life. This scenario provides evidence for which of these concepts?

international economic development agencies harm poorer nations by encouraging them to serve as exporters to wealthier nations.

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the viking voyages took place during the middle ages, which was about this time. 500 to 1350. the viking voyages took place during the middle ages, which was about this time.