Could anyone help me with this? Mid-ocean ridge rift zones produce new crust. Depending on the rift, 1 cm/yr to more than 10 cm/yr can be produced. 1. The distance between Newfoundland, Canada, and Ireland is roughly 3,320 kilometers. If the Mid-Atlantic Ridge is spreading at 4 cm/year (0.00004 km/year) in that area, how long ago did the Atlantic Ocean separate Canada from Ireland?