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In Our Time · August 27, 2026 · 44m

Archive: Plate Tectonics

Joe Cann, Lynne Frostick, Richard Corfield
Show Notes

In this archive edition of In Our Time, Misha Glenny revisits a January 2008 discussion on plate tectonics, the revolutionary theory that the Earth's outer shell is divided into moving plates. Richard Corfield, Joe Cann, and Lynne Frostick explain how this idea solved long-standing geological puzzles—from the matching shapes of Africa and South America to the distribution of fossils across oceans—and revealed a planet in constant, slow motion where continents drift, mountains rise, and ocean basins widen. The conversation highlights how plate tectonics reshaped our understanding of earthquakes, volcanoes, and the dynamic relationship between the Earth's interior and its surface.

This summary was generated from show notes and public descriptions, not from a full transcript review. Details may contain inaccuracies.

Canon

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Plate Tectonics: Earth's Surface on the Move00:00:00
The Earth's outer shell is broken into rigid plates that drift atop a layer of hot, convecting mantle, continuously reshaping continents and oceans.
ClaudeChatGPTGemini

Highlights

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A World in Slow Motion: Continents Drift and Oceans Change Size00:00:00
America moves away from Europe at about the speed fingernails grow; the Pacific is contracting, the Red Sea is widening, and the Himalayas are still rising.
ClaudeChatGPTGemini
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A Scientific Revolution That Re-Wired Geology00:00:00
Plate tectonics was a genuine scientific revolution that changed the way geologists, and many others, understand the Earth.
ClaudeChatGPTGemini

Misc

✧America is getting further away from Europe—not a political statement but a geological fact.
✧The Horn of Africa will one day become a large island.
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