The Grand Canyon's layers were once an ocean, a beach, a river, and even a desert-all in the very same place.How could that be?Juno and Pebble discover that every colorful layer of the canyon holds clues to a different ancient world, stacked one on top of another like chapters in a giant storybook. As Juno learns to read the secrets hidden in the rocks, she realizes that Earth has changed again and again over millions of years.But one big mystery remains: If all these ancient worlds are buried together, who uncovered them?Tomorrow, Juno and Pebble follow the river.
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