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The Navajo Sandstone forms a near-vertical cliff at Zion NP whereas the underlying Kayenta Formation forms a broad slope. What is the reason for the difference?

The Navajo Sandstone forms a near-vertical cliff at Zion NP whereas the underlying Kayenta Formation forms a broad slope. What is the reason for the difference?

Applications and Investigations in Earth Science (9th Edition)
Applications and Investigations in Earth Science (9th Edition)
9th Edition
ISBN:9780134746241
Author:Edward J. Tarbuck, Frederick K. Lutgens, Dennis G. Tasa
Publisher:Edward J. Tarbuck, Frederick K. Lutgens, Dennis G. Tasa
Chapter1: The Study Of Minerals
Section: Chapter Questions
Problem 1LR
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**Question:** The Navajo Sandstone forms a near-vertical cliff at Zion National Park, whereas the underlying Kayenta Formation forms a broad slope. What is the reason for the difference? **Options:** - The Kayenta is protected from weathering and erosion by the underlying hard rocks of the basement. - The Navajo has a dense network of joints cutting through it, whereas the Kayenta is relatively free of fractures. - The Kayenta has a dense network of joints cutting through it, whereas the Navajo is relatively free of fractures. - **The rocks of the Kayenta are less resistant to weathering and erosion than the rocks of the Navajo.** *(Correct Answer)* - The sandstone of the Navajo breaks down easily when rainfall or snowmelt penetrate into the rock, whereas the shale and siltstone of the Kayenta doesn’t permit water to penetrate deeply.
Transcribed Image Text:**Question:** The Navajo Sandstone forms a near-vertical cliff at Zion National Park, whereas the underlying Kayenta Formation forms a broad slope. What is the reason for the difference? **Options:** - The Kayenta is protected from weathering and erosion by the underlying hard rocks of the basement. - The Navajo has a dense network of joints cutting through it, whereas the Kayenta is relatively free of fractures. - The Kayenta has a dense network of joints cutting through it, whereas the Navajo is relatively free of fractures. - **The rocks of the Kayenta are less resistant to weathering and erosion than the rocks of the Navajo.** *(Correct Answer)* - The sandstone of the Navajo breaks down easily when rainfall or snowmelt penetrate into the rock, whereas the shale and siltstone of the Kayenta doesn’t permit water to penetrate deeply.
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