Hi manugavassi45,
Your Question:
How do scientists use relative and absolute dating and the geologic time scale to organize Earth's 4.6-billion-year-old history?
Answer:
Scientists mostly use geologic times, for example, the ice age or the the dinosaur era. They can use other things and date back to when that happened. For Example when they find fossils from dinosaurs or other extinct animals on the earth. Lots of precious ore and artifacts can be dated back to when there were all those empires.