Definition

1. Proper Noun:
   • A major underwater mountain range: The Mid-Atlantic Ridge is a very long, narrow, and elevated geological feature on the floor of the Atlantic Ocean. It is a divergent tectonic plate boundary where the Eurasian and North American plates are moving apart in the north, and the African and South American plates are moving apart in the south. This movement causes magma to rise, creating new oceanic crust and forming this massive, continuous ridge.

Examples of Usage

• Proper Noun:
  • Scientists study the volcanic activity along the Mid-Atlantic Ridge.
  • The discovery of the Mid-Atlantic Ridge was crucial for the development of the theory of plate tectonics.
  • Iceland is one of the few places where the Mid-Atlantic Ridge is visible above sea level.

Advanced Usage

• "The ridge": In geological and oceanographic contexts, "the ridge" is often used as a shorthand reference to the Mid-Atlantic Ridge when it is clear from the discussion.
  • The research vessel is mapping hydrothermal vents along the ridge.

Variants and Related Words

• Oceanic ridge (n): The general term for a long, seismically active submarine mountain system formed by plate tectonics. The Mid-Atlantic Ridge is a specific example.
• Divergent boundary (n): The type of tectonic plate boundary where two plates move away from each other, often marked by a mid-ocean ridge like the Mid-Atlantic Ridge.
• Seafloor spreading (n): The geologic process that occurs at mid-ocean ridges, where new oceanic crust is formed through volcanic activity and then gradually moves away from the ridge.

Synonyms

• Submarine ridge: A more general term for an underwater mountain range.
• Mid-ocean ridge: The broader category of underwater mountain systems of which the Mid-Atlantic Ridge is a part.

Related Phrases

• Ridge axis: The central, most active part of the ridge where volcanic and tectonic activity is concentrated.
  • Most earthquakes occur near the ridge axis.
• Rift valley: The central valley that runs along the crest of many mid-ocean ridges, including parts of the Mid-Atlantic Ridge, formed by the pulling apart of tectonic plates.
  • The rift valley within the ridge is several kilometers wide.

Noun

1. a very long narrow elevation on the ocean floor that runs all the way from Iceland in the North Atlantic to Bouvet Island in the South Atlantic