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The Grand Canyon: How It Formed | PBS LearningMedia

The Grand Canyon: How It Formed | PBS LearningMedia

The theory of how the Grand Canyon was formed is shown in this animation from NOVA, and features rare footage of a phenomenon known as debris flow.

pbslearningmedia.org2009年1月1日

Grand Canyon Helicopter Tour

Grand Celebration Helicopter Tour | GrandCanyon.com

Grand Celebration Helicopter Tour | GrandCanyon.com

grandcanyon.com

Grand Canyon Helicopter Tour with Canyon Floor Champagne Landing

Grand Canyon Helicopter Tour with Canyon Floor Champagne Landing

2016年10月4日

5 Star Helicopter Tours

5 Star Helicopter Tours

5starhelicoptertours.com

2016年2月19日

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Nature: Grand Canyon National Park

Nature: Grand Canyon National Park

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Grand Canyon Geology with Wayne Ranney

Grand Canyon Geology with Wayne Ranney

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Grand Canyon Skywalk

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Grand Canyon Skywalk

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The Grand Canyon's Glass-Bottom Skywalk

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