geologists determine a rocks relative age and....?

I suspect they are interested in the composition of the rock.

if i mix sugar into a glass of water into no longer seen what is it called

Geologists determine a rock's relative age by studying the principles of stratigraphy and using various methods such as superposition, cross-cutting relationships, and fossil correlation. These techniques help geologists establish the order of events in Earth's history. In addition to determining relative age, geologists also gather information about the rock's absolute age through radiometric dating techniques. By analyzing the radioactive isotopes in rock samples, geologists can determine the precise age of the rock. Radiometric dating methods include Carbon-14 dating for organic materials and methods like Potassium-Argon dating or Uranium-Lead dating for rocks and minerals. These methods rely on the decay of radioactive isotopes into stable isotopes at a known rate to calculate the age of the rock. By combining relative dating principles with absolute dating techniques, geologists can gain a comprehensive understanding of the age and history of rocks.