Gravity's pull is a constant on Earth, but our planet is no uniform sphere.
Deep beneath the Indian Ocean, that pull weakens to an extreme low, leaving what is considered a massive gravity 'hole' some three million square kilometers in size roughly where the seafloor sinks into a vastOne of the most profound gravitational anomalies on Earth, its presence has been alluded to for a while.
Just what caused this relative weakening has never been clear. Now two researchers from the Indian Institute of Science think they have a better idea of the kinds of planetary phenomena that could be involved. "All these [past] studies looked at the present-day anomaly and were not concerned with how this geoid low came into existence," geoscientists Debanjan Pal and Attreyee GhoshThey think the answer lies more than 1,000 kilometers beneath Earth's crust, where the cold, dense remnants of an ancient ocean plunged into a 'But their results, based on computer models, are unlikely to settle a fiery debate about the geoid low's origins – at least not until more data is collected.
The gravitational 'hole' in the Indian Ocean, and the location of seismometers deployed on the seafloor. But a longer view was needed to reconstruct the geoid low in its early phases. So Pal and Ghosh retraced the formation of the massive geoid by modeling how tectonic plates skimmed over Earth's
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