What are three hypothesis about the indus script?

The three hypothesis about the Indus script:

Indus script include the symbols which were used by the people during the Indus valley civilization. There were three hypothesis related to this script which were

a mid-ocean ridge or mid-oceanic ridge is an underwater mountain range, formed by plate tectonics. this uplifting of the ocean floor occurs when convection currents rise in the mantle beneath the oceanic crust and create magma where two tectonic plates meet at a divergent boundary.a geomagnetic reversal is a change in a planet's magnetic field such that the positions of magnetic north and magnetic south are interchanged.

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