Discussion
The negative Bouger anomaly across the Mid-Oceanic ridges is due to :
Answer: C
The key attributes the anomaly to Hot mantle surrounded by cold mantle.
The Bouguer correction removes the effect of the ridge's topography, so what remains reflects density below. Beneath the ridge axis lies hot, partly molten, low-density mantle, while the older lithosphere on either side has cooled and become denser. The mass deficit of this hot upwelling compared with the surrounding colder mantle produces the negative Bouguer anomaly over the ridge.
Ridge topography is exactly what the Bouguer correction strips out. Mantle convergence would occur at subduction zones, not ridges, and ridge push is a force driving plates, not a density structure.
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