Continental-continental boundaries occur where two continental plates collide. This interaction typically leads to the formation of mountain ranges, as neither plate is subducted due to their similar densities. A well-known example of this is the Himalayas, which were formed by the collision of the Indian Plate and the Eurasian Plate. These boundaries are characterized by intense geological activity, including earthquakes and volcanic activity, although volcanic eruptions are less common than at oceanic boundaries. The uplift of land at these boundaries can create dramatic landscapes, influencing local climates and ecosystems.