Why don't mountains not last forever?

Mountains do not last forever due to erosion and geological processes. Over time, weathering from wind, water, and ice wears down their surfaces, while tectonic activity can cause them to shift or collapse. Additionally, the forces that create mountains, such as volcanic activity and tectonic uplift, are not constant, leading to cycles of formation and erosion. Ultimately, these natural processes continuously reshape the Earth's landscape, preventing mountains from enduring indefinitely.