What are some events that all of us have had in our lives? Ask the class "What are some events that all of us have had in our lives?" Make a list of 5 or 6 things on the board. Let’s organize these!

Earth’s history spans 4.54 billion years, and scientists use the geologic time scale to divide it into eons, eras, periods, and epochs. By studying rock layers, fossils, and isotopes, they can ...

Evolution of endogenic processes is indicated by simulated melt production rate and mare basalt volume. Evolution of exogenic process is indicated by impactor kinetic energy. The points represent ages ...

In this mind-bending journey, we’re going to explore 25 facts about geologic time that will fundamentally change how you think about our planet, life itself, and humanity’s place in the cosmic story.