Wanderlust World Wanderlust World The Mid-Ocean Ridge (MOR) is a continuous, ~65,000 km (40,000 mi) long mountain system winding through all major oceans. It is the longest and largest mountain range on Earth—mostly submerged, with only a few peaks (Iceland, Azores, Ascension, Galápagos) breaking the surface.
The MOR is a divergent plate boundary. As tectonic plates pull apart, mantle rock rises, decompresses, melts, and erupts as basalt, creating new oceanic crust. This process—seafloor spreading—drives plate tectonics and planetary heat loss.
| Segment | Ocean | Spreading Rate | Key Features |
|---|---|---|---|
| Mid-Atlantic Ridge | Atlantic | Slow (~2.5 cm/yr) | Deep rift valley, Iceland, Azores, Ascension, Bouvet. |
| East Pacific Rise | Pacific | Fast (~10–15 cm/yr) | Broad rise, hydrothermal vents (9°N, 13°N), Galápagos. |
| Juan de Fuca Ridge | NE Pacific | Intermediate | Near Cascadia subduction; Endeavour vents. |
| Southwest Indian Ridge | Indian | Ultra-slow | Highly segmented, amagmatic sections. |
| Central Indian Ridge | Indian | Intermediate | Rodrigues Triple Junction. |
| Gakkel Ridge | Arctic | Slowest (<1 cm/yr) | Ice-covered, unique volcanism, hydrothermal vents. |
The Mid-Ocean Ridge is the planet's most extensive geological feature—the engine of plate tectonics, a cradle of unique life, a recorder of Earth's history, and a frontier for science and stewardship. Understanding it is key to understanding our dynamic planet.