Assertion: ridge's valley | /r/HasProperty | active
Facets:
value: seismologically
type: DEGREE
Source sentences:
text: In the 1950s, mapping of the Earth's ocean floors by Bruce Heezen, Maurice Ewing, Marie Tharp and others revealed that the Mid-Atlantic Ridge had a strange bathymetry of valleys and ridges, with its central valley being seismologically active and the epicenter of many earthquakes.
text: Its central valley is seismologically active and the epicentre of many earthquakes.