Gravity anomalies are variations in the strength of Earth's gravitational field across different regions. These anomalies are caused by variations in the density of rocks beneath the Earth's surface. By measuring and analyzing gravity anomalies, scientists can gather valuable information about the composition and structure of the Earth's interior, as well as geological features such as mountains, faults, and magma chambers. Gravity anomaly data is commonly used in geophysics, geology, and archaeology to study Earth's subsurface and to make predictions about geological hazards or natural resources.