Ice ages boost production of new ocean crust
Lower sea levels amplify magma outpourings
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