Abstract
The oceanic crust covers approximately 60% of the Earth's surface. The crustal structure appears to vary systematically with a rather small number of parameters: the age of the crust; the spreading rate at which the it was formed; its position with respect to offsets in the ridge axis; and the proximity or otherwise of thermal or chemical perturbations, such as mantle plumes, at the time of crustal formation or later in its history.
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