Which evidence would strongly support the contention that a local area is experiencing acid deposition?

The increase in the concentration of soluble metals in the lake serves as strong evidence for acid deposition. Acid deposition occurs when pollutants, such as sulfur dioxide and nitrogen oxides, are released into the atmosphere and subsequently fall to the ground in the form of acidic rain or snow. This process can alter the chemistry of lakes and soils, leading to the leaching of soluble metals, such as aluminum, from rocks and soil into the water.

The presence of higher concentrations of these metals directly correlates with the effects of acid deposition, as acidic conditions can dissolve minerals that would otherwise remain immobilized. The decline in pH associated with acid deposition can have harmful impacts on aquatic ecosystems, leading to issues for fish and other wildlife, and can also impact the overall health of the water body.

Other options, while potentially related, do not provide direct evidence of acid deposition. A decrease in fish populations, for instance, could result from various factors like habitat destruction, overfishing, or pollution from other sources. Improved air quality measurements would suggest that the levels of pollutants causing acid deposition may have decreased, contradicting the idea that acid deposition is occurring. A rise in local tourism might indicate a healthier environment but does not specifically indicate acid deposition is happening in that area