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Yosemite National Park Rock Slide

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Questions and Answers

What process has been the dominant force shaping the granite extrusions of Yosemite Valley since the glaciers retreated?

Erosion

Melting

Exfoliation (correct)

Intrusion

What is the chief geologist, Stock, speculating as a possible cause for the cracks in Half Dome to snap?

Rainfall (correct)

Sun exposure

Glacier activity

Magma intrusion

What caused the tough, granite intrusions like Half Dome to be exposed over time?

Magma bubbles reaching the surface

Erosion by rainfall

Exfoliation process

Retreat of glaciers (correct)

What led to the formation of intrusions like Half Dome in Yosemite Valley?

Magma bubbles pushing through layers of continental crust (B) Signup and view all the answers

What process contributed to the formation of peaks like Half Dome and El Capitan in Yosemite?

Glacial erosion (D) Signup and view all the answers

What caused a pair of climbers to notice a massive section of missing rock on Half Dome?

They noticed a big dirt outline where the ledge was supposed to be. (C) Signup and view all the answers

Why did nobody notice when the 5 million pound slab slid off the face of Half Dome?

Rock falls are so common in Yosemite that it went unnoticed. (D) Signup and view all the answers

What is the primary cause of the numerous rock falls in Yosemite Valley?

Exfoliation resulting from unique geologic processes. (C) Signup and view all the answers

When did the North American plate start overriding the Pacific plate, leading to the formation of Yosemite Valley?

25 million years ago. (D) Signup and view all the answers

What is the approximate frequency of rock falls in Yosemite Valley per year?

60 rock falls per year. (C) Signup and view all the answers