Earth dating wiki
Click the plus sign next to the category name to show a list of data sets.
To answer these questions, you have to think about times that were millions or billions of years ago.
Check the boxes for the data set(s) you want to search.
In the process of relative dating, scientists do not determine the exact age of a fossil but do learn which ones are older or younger than others.
They saw that the fossils in older rocks are different from the fossils in younger rocks.
Historical geologists are scientists who study the Earth's past.
They study clues left on the Earth to learn two main things: the order in which events happened on Earth, and how long it took for those events to happen.
This year, the contest expanded to include a collaboration with the United Nations Educational, Scientific and Cultural Organization, better known by its acronym UNESCO.