They are divided into "normal" MORB or N-MORB, with relatively low abundances of these elements, and enriched E-MORB.[20] The enrichment of water correlates well with that of these elements. In N-MORB, the water content of the source mantle is inferred to be 0.08–0.18 wt%, while in E-MORB it is 0.2–0.95 wt%.[2]