Triple

Target class: underwater rift
Context triple: [Silfra fissure, instanceOf, underwater rift]

• A. undersea earthquake
  An undersea earthquake is a sudden release of energy along faults beneath the ocean floor, causing seismic shaking that can displace large volumes of water and potentially generate tsunamis.
• B. oceanic trench
  An oceanic trench is a long, narrow, and extremely deep depression in the ocean floor, typically formed at convergent plate boundaries where one tectonic plate subducts beneath another.
• C. submarine basin
  A submarine basin is a large, low-lying depression on the ocean floor that collects sediments and is often bounded by higher seafloor features such as ridges or continental margins.
• D. submarine canyon
  A submarine canyon is a steep-sided underwater valley incised into the continental shelf and slope, often extending from the mouth of a river and serving as a major pathway for transporting sediments from shallow to deep ocean basins.
• E. submarine geological feature chosen
  A submarine geological feature is a naturally occurring structure or landform on the ocean floor, such as seamounts, trenches, ridges, or hydrothermal vents, formed by geological processes beneath the sea.
• F. None of above.