What cause mt Rushmore to crack?

Answer 1

Mount Rushmore has experienced cracking primarily due to natural weathering processes, including freeze-thaw cycles that cause water to seep into cracks, freeze, and expand, leading to further deterioration. Additionally, the granite's inherent weaknesses and the mountain's geological activity contribute to these cracks. Human activity, such as the vibrations from nearby traffic and construction, can also exacerbate the issue. Regular monitoring and maintenance efforts are undertaken to manage and mitigate the damage.