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Chapter 5: Problem 1

What has to happen to a body of rock before exfoliation can take place?

Short Answer

Expert verified
For exfoliation to occur in a body of rock, it must be subjected to stressors such as temperature changes, pressure release, or chemical reactions that weaken its structure. Additionally, the rock must have layers or structural weaknesses that allow for the separation of the outer layers from the rest of the body.

Step by step solution

01

Exfoliation definition

Exfoliation is a geological process by which the outer layers of a rock are shed or removed, typically caused by weathering and erosion. This process results in dome-shaped features, as layers peel off in concentric shells.
02

Identify factors leading to exfoliation

Several factors can contribute to exfoliation, including: 1. Changes in temperature: As a body of rock experiences fluctuations in temperature, it expands and contracts. Over time, this can cause the outer layers to crack and eventually peel off. 2. Pressure release: When overlying material (such as soil or other rock layers) is removed, the pressure on the underlying rock decreases. This can lead to expansion of the rock, causing the outer layers to crack and peel away. 3. Chemical weathering: The exposure of a rock to water and air can result in various chemical reactions that weaken the rock's structure. Eventually, this can lead to the outer layers breaking off.
03

Determine necessary conditions for exfoliation

Before exfoliation can take place in a body of rock, the following conditions must be met: 1. The rock must be subjected to stressors such as temperature changes, pressure release, or chemical reactions that weaken its structure. 2. The rock must have layers or structural weaknesses that allow for the separation of the outer layers from the rest of the body. In conclusion, for a body of rock to undergo exfoliation, it must be exposed to weathering and erosion processes that cause stress, and it must have a layered or weak structure that facilitates the separation of the outer layers.

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