What is geologic mapping?

Geologic mapping is primarily focused on representing geological features on a map in order to convey important information about the Earth's subsurface composition and structure. This involves detailing various aspects such as rock types, geologic structures (like faults and folds), and the relationships between different geological layers. The purpose of geologic maps is to assist in understanding the distribution of resources, hazards, and groundwater, as well as providing a framework for geological research.

The other options do not accurately describe geologic mapping. Creating topographical maps is primarily concerned with the physical landscape and elevation, not specifically the geological attributes of the terrain. Measuring seismic activity involves monitoring and analyzing vibrations in the Earth, which is distinct from the mapping of geological features. Categorizing different rock types can be part of the mapping process, but it does not encompass the full scope of what geologic mapping entails, which includes the spatial relationships and distribution of those rock types on a map.