Acid rain would be a greater problem in an area with marble bedrock than in an area with granite bedrock. Here's why:

* Marble's Composition: Marble is primarily composed of calcium carbonate (CaCO₃). This makes it susceptible to chemical weathering by acidic rain. The acid (primarily sulfuric acid and nitric acid) reacts with the calcium carbonate, dissolving it and forming calcium sulfate and carbon dioxide. This process weakens the marble, causing it to erode and potentially leading to structural damage in buildings or monuments made of marble.

* Granite's Composition: Granite is composed of quartz, feldspar, and mica. These minerals are generally more resistant to acid weathering than calcium carbonate. While granite can still be affected by acid rain over time, the impact is significantly less pronounced compared to marble.

In summary: Marble, due to its composition, is much more vulnerable to acid rain than granite. This vulnerability can lead to accelerated weathering and damage in areas with marble structures and landscapes.