Ice ages boost production of new ocean crust

Lower sea levels amplify magma outpourings

Abyssal hills

SEA SUMMIT  Rows of thick ocean crust called abyssal hills, which run parallel to the mid-ocean rift (yellow, center) in this seafloor map, formed during ice ages when lower sea levels caused larger magma outpourings at mid-ocean ridges, new research suggests.

LarryMayer/Univ. of New Brunswick Ocean Mapping Group

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