Positive magnetic anomalies are evidence that the subsurface might locally contain iron-bearing minerals.

Name: Positive magnetic anomalies are evidence that the subsurface might locally contain iron-bearing minerals.
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Positive magnetic anomalies occur when the Earth's magnetic field is locally stronger, which often happens due to the presence of iron-bearing minerals (like magnetite) in the subsurface, as they have strong magnetic properties.

Positive Magnetic Anomalies Are Evidence That the Subsurface Might Locally