Answer:
Archaeologists use written sources to help them find sites where they will find arti- facts. Similarly, historians examine material culture to help them understand what they read. Anthropologists study the characteristics of past and present human communities through a variety of techniques. In doing so, they investigate and describe how different peoples of our world lived throughout history. To establish a relative time frame, geologists have arranged the rocks in a continuous sequence of chronostratigraphic units on a planetary scale, divided into eonothems, erathemes, systems, series and floors, based on stratigraphy, that is, on the study and interpretation of the strata, supported by major biological and geological events.