Here's why:

* Chemical Weathering: This type of weathering involves changes in the chemical composition of rocks. Acids, like those found in acid rain, react with minerals in rocks, breaking them down and changing their composition.

* How Acid Precipitation Works: The acids in rain (mainly sulfuric and nitric acid) react with minerals like carbonates (found in limestone and marble) and feldspars (found in granite). These reactions create new, more soluble compounds that can be dissolved and carried away by water.

Examples:

* Acid Rain and Limestone: Acid rain reacts with calcium carbonate in limestone, forming calcium sulfate, which is more soluble and can be dissolved. This process can create sinkholes and caves.

* Acid Rain and Granite: Acid rain can dissolve feldspars in granite, weakening the rock and leading to its breakdown.

Let me know if you have any other questions about weathering!