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!

Millions of people around the world know of the Grand Canyon and many Arizonans have visited it — but few comprehend the incredible complexity and age of the rocks that form this vast gash in the ...

Our planet, at least for the time being, remains firmly in the Holocene epoch which began 11,700 years ago with the most recent melting of the ice sheets, years of stable climate during which human ...