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Research scientists have hit upon a potentially revolutionary way of measuring the heat hidden deep in Earth's oceans: track the subtle shifts in our planet's magnetic field caused by tides, swells, eddies, and even tsunamis. The salt in ocean water makes it conductive, and as it ebbs and flows it drags Earth's magnetic field to and fro. Highly sensitive magnetic-field sensors can detect those magnetic shifts, and researchers have demonstrated - at least at the proof-of-concept level - that such data can be used to determine the ocean's hidden heat content. [Source: The Register]
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