| 1 | The researchers were able to detect these crustal motions with a global positioning system (GPS). | |
| 2 | The hypothesis was substantiated soon afterward by the discovery that periodic reversals of the Earth' s magnetic field are recorded in the oceanic crust. | |
| 3 | With this relatively rapid removal of weight, the crust rebounded and bulged slightly up from its previous position. | |
| 4 | Such "pulsar glitches" likely result from brief interactions between the neutron star's solid crust and superfluid interior. | |
| 5 | Once the molten debris coalesced into the moon, the theory goes, its crust solidified over several hundred million years. |
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