Wiktionary
n. a mid-oceanic ridge
Wikipedia
A mid-ocean ridge is an underwater mountain system formed by plate tectonics. It consists of various mountains linked in chains, typically having a valley known as a rift running along its spine. This type of oceanic mountain ridge is characteristic of what is known as an oceanic spreading center, which is responsible for seafloor spreading. The production of new seafloor results from mantle upwelling in response to plate spreading; this isentropic upwelling solid mantle material eventually exceeds the solidus and melts. The buoyant melt rises as magma at a linear weakness in the oceanic crust, and emerges as lava, creating new crust upon cooling. A mid-ocean ridge demarcates the boundary between two tectonic plates, and consequently is termed a divergent plate boundary.
Usage examples of "mid-ocean ridge".
In the Atlantic, a belt of volcanic mountains, stretching south from Iceland, marked the position of a mid-ocean ridge, a place where seabed was born, molten material welling up from the planet&rsquo.
The great mid-ocean ridge runs forty thousand miles around the globe.
In the Atlantic, a belt of volcanic mountains, stretching south from Iceland, marked the position of a mid-ocean ridge, a place where seabed was born, molten material welling up from the planet’.