Long narrow cracks or splits in rock, earth, or other hard material.
From Old French 'fissure,' derived from Latin 'fissus' (split), past participle of 'findere' (to split). Entered English in the 14th century for geological features.
The mid-ocean ridge fissures constantly leak new Earth—over 3.5 billion years, the lava pouring from these cracks created our entire ocean floor, a process still happening right now.
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