For the past 100 million years, redeposited sediment has gradually increased the size of the Mississippi River Delta. But over the past several decades, the coast of southern Louisiana has been losing rather than...
In this exercise, students investigate methods used by geologists studying active tectonics for determining ages in actual numbers of years. Introductory materials describe the three most-used techniques for dating...
The Grand Time Game is a collection of activities that teach students about geologic time. The game elements consist of a tabletop model that demonstrates the geologic history of the Grand Canyon, a script in which...
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