Uneven surfaces are a result of the planet’s unequal distribution of gravity. Geoids are the name for these irregularities on the Earth’s undulating map. An example of one such feature is a “gravity hole”-like area beneath the Indian Ocean where the pull is extremely weak.

Approximately 2 million kilometres are covered by the Indian Ocean Geoid Low (IOGL), according to an article in Science Alert.
Geologists who have attempted to understand the IOGL’s origins have always been intrigued by it. However, a recent study asserts that it has the solution at last.

Geophysical Research Letters says that IOGL is formed from remnants of Tethys, an ancient sea. The study, published in Geophysical Research letters, has been carried out two Indian researchers from Indian Institute of Science (IISc) – geoscientists Debanjan Pal and Attreyee Ghosh.

The existence of lighter materials in the upper to mid-mantle, the layer of the Earth between the core and the crust, beneath the IOGL, which the researchers called “low density anomalies,” was discovered to be the cause of the low gravity in this area.

According to the study, the outcomes were based on more than a dozen computer models. According to Professor Pal, the “gravity hole” likely assumed its present form approximately 20 million years ago and will probably endure for millions more. The ancient ocean known as Tethys divided the supercontinents Gondwana and Laurasia.

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