Spreading along the Mid-Atlantic Ridge averages about 2.5 centimetres per year — about 25 kilometres in a million years.
- precision note: Average rate along the ridge, as stated by the source.
- method: Average rates of plate separation are calculated from ocean-floor magnetic striping and the known durations of magnetic reversals.
Evidence support: Supported by the cited evidence one source
Evidence: Kious 1996 Primary authority