Name describe two principles used relative dating rocks
Free 5-day trial Discover how geologists study the layers in sedimentary rock to establish relative age.
This activity on determining age of rocks and fossils is intended for 8th or 9th grade students.
Seriation uses the assumption that once a tool was developed, its use would become more widespread.
Stratigraphy uses the assumption that higher layers or strata were laid down after lower layers.
Despite seeming like a relatively stable place, the Earth's surface has changed dramatically over the past 4.6 billion years.
Mountains have been built and eroded, continents and oceans have moved great distances, and the Earth has fluctuated from being extremely cold and almost completely covered with ice to being very warm and ice-free.
It only sequences the age of things or determines if something is older or younger than other things.