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!

As a kid, it was tough for me to grasp the massive time scale of Earth’s history. Now, with nearly two decades of experience as a geologist, I think one of the best ways to understand our planet’s ...