mid-ocean ridge
/ˈmɪdˈəʊʃən/noun
- Geology a long, seismically active submarine ridge system situated in the middle of an ocean basin and marking the site of the upwelling of magma associated with sea-floor spreading. An example is the Mid-Atlantic Ridge.【地质】大洋中脊（地震频繁的绵长海底山脊, 位于大洋盆地中部, 起因为海底扩展引起岩浆上涌, 如大西洋中脊）。