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Comment: 22:45 - 23:40 (00:55)
Source: Annenberg/CPB Resources - Earth Revealed - 2. The Restless Planet
Keywords: "James Sadd", "plate tectonics", atom, chemistry, "quantum mechanics", physics, gene, DNA, biology
Our transcription: Our gradual understanding of these processes has led to the formulation of what is perhaps the most profound concept in geology.
From time to time, theories result from scientific inquiry that fundamentally alter our view of the world.
These scientific revolutions are elegant in their simplicity and demonstrate new connections between phenomena that had once appeared unrelated.
Some of the better known examples include the theory describing the structure of the atom in chemistry, the theories of quantum mechanics and relativity in physics, and the discovery of genes in DNA in biology.
Within the last few decades, the theory of plate tectonics has revolutionized our understanding of the Earth.
The theory ties together a wide a range of geologic phenomena and makes it abundantly clear that the Earth is indeed a vitally active planet.
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