Need help in understanding gravity anomalies

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Gravity anomalies refer to deviations from expected gravitational acceleration based on simplified models of Earth's gravity. They occur when there are variations in subsurface material density, such as denser materials like iron or less dense materials like salt. To create a gravity anomaly, one could excavate a large hole and fill it with either iron or salt, altering the local gravitational field. This phenomenon highlights the limitations of basic gravitational models, which do not account for these density variations. Understanding gravity anomalies is essential for geophysical studies and resource exploration.
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I want to build a proper understanding about what is gravity anomaly, how it is used, and techniques to produce a gravity anomaly.
 
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Gravity anomalies are simply departures from the predictions of gravitational acceleration produced by a simple model. As for how to produce one: Simple. Dig a very, very big hole and fill it with iron. Or dig a very, very big hole and fill it with salt. Either way, voila! You have a gravitational anomaly. A simple model of Earth's gravity would not contain knowledge of this volume that contains material that is more dense (iron) or less dense (salt) than the surrounding rock.
 
thank you sir
 
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