How could a quiet little river carve the mile-deep Grand Canyon?The secret is patience.Juno can hardly believe that the peaceful Colorado River far below could have created something so vast. But as she follows the river with Pebble, she uncovers the canyon's remarkable secret: millions of tiny grains of sand, carried away day after day, year after year, for millions of years.Juno discovers that even the greatest wonders can be shaped one small step at a time.But deep at the very bottom of the canyon, another mystery awaits-dark, ancient rocks older than anything Juno has ever seen...What secrets could they be hiding?
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