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USGS CMG InfoBank: Sea Floor Spreading

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Comment: 12:06 - 12:56 (00:50)
Source: Annenberg/CPB Resources - Earth Revealed - 5. The Birth of a Theory
Keywords: "Gary Ernst", "continental drift", "sea floor spreading", "Alfred Wegener", "Harry H. Hess", continent, "ocean basin", "mid-oceanic ridge"

Our transcription: What Wegener had evoked was continents floating on and plowing or drifting through ocean basins.
What Hess and others showed was that the ocean basins themselves were growing from mid-oceanic ridges, and that over the course of time, they enlarged from the ridge and spread laterally.
These would then be capable of carrying the continents initially much closer together and actually joined at the onset at the ridge away from one another, directly away from one another, by the spreading process.
The combination of continental drift and sea floor spreading, then, gave them both the mechanism, and the manner, and timing in which the continents had drifted apart from one another.

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