World Mountain Ranges, Volcanoes & Earthquakes
Mountain systems, volcanic landforms, and seismic activities are the dynamic manifestations of Earth's internal endogenic tectonic processes. Fold mountains—including the Himalayas in Asia, the Andes in South America, the Rockies in North America, and the Alps in Europe—formed through continental collision and crustal folding during the Alpine-Himalayan orogeny. Volcanic structures result from magma extrusion, classified into shield volcanoes (Mauna Loa), stratovolcanoes or composite cones (Mount Fuji, Mount Vesuvius), and cinder cones. Intraplate volcanic hotspots, such as the Hawaiian and Yellowstone hotspots, generate volcanic chains as plates drift over stationary mantle plumes. Earthquakes are seismic shockwaves released along fault planes, measured for magnitude on the logarithmic Richter Scale and intensity on the Mercalli Scale.
Key Concepts & Examination Highlights
- The Andes in South America form the world's longest continental mountain range, stretching over 7,000 kilometers across seven nations.
- Mount Everest (Sagarmatha/Chomolungma) on the Nepal-China border is the world's highest peak at 8,848.86 meters above sea level.
- Mauna Loa in Hawaii is the world's largest active shield volcano by volume, rising from the ocean floor over a stationary mantle hotspot.
- The seismic focus (hypocenter) is the internal point where earthquake energy is first released, while the epicenter is the surface point directly above it.