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Explore the Grand Canyon's layers from the nearly 2-billion-year-old rocks of the Pre-Cambrian Era to the few formations of the Mesozoic Era. Learn about the different kinds of rock that make up the canyon and how the Colorado River carved them into the majesty of the Grand Canyon today. Additional features include a diagram labeling each of the layers, Fast Facts, a phonetic glossary, an index, an introduction to the author, and further sources for...
Author
Description
During the 1960s and early 1970s, northern Arizona played a critical role in fulfilling President Kennedy?s bold challenge of sending humans to the moon. From the rocky depths of the Grand Canyon to lofty cosmic views from Flagstaff?s dark skies, northern Arizona was ideal for activities ranging from moon buggy testing and geology training to lunar mapping and mission simulation. Every astronaut who walked on the moon, from Neil Armstrong to Gene...
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