fissure
noun /ˈfɪʃə(r)/
  /ˈfɪʃər/
(specialist)- a long deep opening in something, especially in rock or in the earth(岩石、土地等中深长的)裂缝,裂隙 - parched grassland dissected by open dry fissures干燥的草原被开阔干燥的裂缝分割 
- fissures in the ocean floor海底的裂缝 
 词源late Middle English: from Old French, or from Latin fissura, from findere ‘to split’.
- parched grassland dissected by open dry fissures