What are mountains?

Mountains are large landforms that rise significantly above the surrounding terrain, typically with steep slopes, a peak, and substantial elevation. A common threshold is 300–600 meters above surrounding land.

How mountains form four main processes:

1. Fold mountains tectonic plates collide and crust folds upward Examples: Himalayas, Alps, Andes, Rockies
2. Fault-block mountains tectonic faults cause blocks of crust to be uplifted or dropped Examples: Sierra Nevada (USA), Vosges (France)
3. Dome mountains magma pushes upward without erupting, creating a dome-shaped uplift Examples: Black Hills (South Dakota)
4. Volcanic mountains lava and ash accumulate from volcanic eruptions Examples: Mount Fuji, Mount Kilimanjaro, Mount St. Helens

Mountain facts:

• Highest peak: Mount Everest 8,848.86 m (Nepal/Tibet)
• Longest range: Andes 7,000 km along western South America
• Mountains cover approximately 22% of Earth's land surface
• About 915 million people live in mountain regions

Importance: Water towers for major rivers, biodiversity hotspots, climate regulators, cultural and spiritual significance