Geophysical surveying is a method used to explore the Earth's subsurface without drilling. It employs various techniques, such as seismic, magnetic, and electrical resistivity methods, to gather data about the geological features below the surface. This information helps in identifying resources like minerals, oil, and groundwater, as well as assessing environmental conditions. The data collected from geophysical surveys can be analyzed to create detailed maps of underground structures. These surveys are essential in fields such as archaeology, civil engineering, and environmental science, providing valuable insights for planning and decision-making in various projects.