Marine magnetic anomalies can be used to estimate the rate of seafloor spreading rate of earth's expansion rate of seafloor subsidence age of the seafloor sediments

Marine magnetic anomalies can be used to estimate the rate of seafloor spreading. Seafloor spreading was supported by the evidence that marine magnetic anomalies provided. By matching the marine magnetic anomaly with the time-scale, you can determine how old the oceanic lithosphere in a certain point.

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This would be an open primary. a closed primary people can vote only prior to election day if the party if they are registered. independent voters can not participate. there is not a wide-open primary, but there is a semi-open primary.