Submitted by khenkes on Tue, 12/28/2021 - 17:07
Provides an introduction to the geologic time scale, and explains that the types of fossils found in rocks of various ages differ because life on Earth has changed over time.
Submitted by khenkes on Wed, 10/02/2019 - 15:46
Provides an introduction to the geologic time scale, and explains that the types of fossils found in rocks of various ages differ because life on Earth has changed over time.
