Here's why:
* Convergent Plate Boundaries: When two tectonic plates collide, the denser plate subducts (sinks) beneath the less dense plate. This process creates tremendous pressure and heat, leading to:
* Folding and Uplifting: The rocks above the subduction zone are compressed and folded, creating mountains.
* Volcanism: Molten rock (magma) rises from the subducting plate, often erupting at the surface and forming volcanoes, which can also build up mountain ranges.
* Examples:
* The Himalayas: Formed by the collision of the Indian and Eurasian plates.
* The Andes Mountains: Formed by the subduction of the Nazca plate beneath the South American plate.
* The Alps: Formed by the collision of the African and Eurasian plates.
Other processes that can contribute to mountain formation, but are less common for extensive ranges, include:
* Fault-block Mountains: These form when blocks of Earth's crust are uplifted along faults, creating a series of parallel mountains and valleys.
* Upwarping: This involves a broad upward bulge in the Earth's crust, leading to a plateau-like mountain range.
While these processes can create mountains, they typically result in smaller, more localized mountain ranges compared to those formed by convergent plate boundaries.
