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Rock Behavior Under Stress
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Rock Behavior Under Stress
Rock Behavior Under Stress
Study
Question
What happens to rock when stress is applied?
Answer
Rocks respond to stress by undergoing strain or deformation.
Question
What is boundary stress in relation to rocks?
Answer
Boundary stress refers to the effects on rocks due to different types of plate boundaries: Divergent (rocks are pulled apart), Convergent (rocks are squeezed), and Transform (rocks are twisted).
Question
What are the three types of boundary stress?
Answer
1. Tension - rocks being pulled apart. 2. Compression - rocks being squeezed. 3. Shear - rocks being twisted.
Question
What are the main responses of rocks to applied stress?
Answer
Rocks can respond to stress in three ways: 1. Deform elastically. 2. Deform plastically. 3. Break or fracture.
Question
What is strain in the context of rocks?
Answer
Strain is the resulting change in the rocks due to different types of stress, specifically the change in size, shape, or volume of the rock subjected to stress.
Question
What factors determine a rock's response to stress?
Answer
A rock's response to stress depends on the rock type, surrounding temperature and pressure conditions, length of time under stress, and type of stress.
Question
What are the three possible responses of rocks to increasing stress?
Answer
1. Elastic deformation - The rock returns to its original shape when stress is removed. 2. Ductile Plastic deformation - The rock does not return to its original shape when stress is removed. 3. Fracture - The rock breaks if stressed enough.
Question
How are rocks classified based on their behavior under stress?
Answer
1. Brittle Materials - exhibit small region of ductile behavior before fracture and could have small or large region of elastic behavior. 2. Ductile Materials - exhibit large region of ductile behavior prior to fracture but only small region of elastic behavior.
Question
Under what conditions is a rock more likely to fracture?
Answer
A rock is more likely to fracture at the Earth's surface where rocks usually break quickly, compared to deeper in the crust where temperatures and pressures are higher, leading to plastic deformation.
Question
What is the effect of sudden stress on rocks?
Answer
Sudden stress, such as a hit with a hammer, is more likely to cause a rock to break.
Question
How does the rate of stress application affect rock deformation?
Answer
Stress applied over time often leads to plastic deformation, while rapid stress application, such as from an extraterrestrial impact or an earthquake, increases the tendency for the rock to fracture.
Question
What is the effect of temperature on rock deformation?
Answer
Higher temperatures lead to more plastic behavior in rocks, and some rocks or sediments are more plastic when they are wet.
Question
What is the relationship between moisture and rock plasticity?
Answer
Some rocks or sediments are more plastic when they are wet.
Question
What role does temperature play in the behavior of different rocks under stress?
Answer
Different rocks at different temperatures will behave in different ways to stress, with higher temperatures leading to more plastic behavior.
Question
What are some types of strain responses illustrated in the study material?
Answer
Different types of strain response are illustrated in Figure 12.3.