process of Earth's magnetic poles changing places

New oceanic lithosphere forms as a result of

process that takes place as mid-ocean ridges

Evidence for sea-floor spreading

items that provide evidence that the continents were once closer together

Wegner thought that all the continents were once together in one large continent called

part of molten rock at mid-ocean ridges

hypothesis that states that the continents were once one large mass that broke apart

Plate Tectonics explains

Laurasia was in the southern part and Gondwana was in the northern part of the plates

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