Why?
* Chemical Composition: Limestone is primarily composed of calcium carbonate (CaCO3). Calcium carbonate reacts readily with acids, such as sulfuric acid and nitric acid found in acid rain.
* Solubility: The reaction between calcium carbonate and acid produces calcium ions and bicarbonate ions, which are soluble in water. This dissolves the limestone, causing it to decay.
* Porosity: Limestone is often porous, which allows acid rain to penetrate deeper into the rock, increasing the rate of decay.
Other Rocks and Their Resistance to Acid Rain:
* Granite: Granite is more resistant to acid rain because it is primarily composed of quartz and feldspar, which are less reactive with acids.
* Basalt: Basalt is also relatively resistant to acid rain due to its high content of silica and magnesium.
* Sandstone: Sandstone can vary in its resistance to acid rain depending on the composition of the sand grains.
Conclusion:
Limestone is the most susceptible rock to decay from acid rain due to its chemical composition, solubility, and porosity.
