Rocks and Stress Deformation
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Questions and Answers

What happens when rocks are stressed?

  • Rocks undergo deformation, changing in size or shape. (correct)
  • Rocks become indestructible when stressed.
  • Rocks remain unchanged when subjected to stress.
  • Rocks experience emotional stress like humans.

Which type of stress is similar to pulling on a string from both ends after it is fully extended?

  • Torsional stress
  • Tensional stress (correct)
  • Shear stress
  • Compressional stress

In which stage of rock deformation is the change reversible?

  • Plastic deformation
  • Permanent deformation
  • Elastic deformation (correct)
  • Brittle deformation

What happens during compressional stress?

<p>Rocks are pressed together. (A)</p> Signup and view all the answers

How does shear stress affect rocks?

<p>Rocks slip in a horizontal direction. (C)</p> Signup and view all the answers

What happens to rocks when they experience ductile deformation?

<p>They can be changed into a new shape and stay that way. (C)</p> Signup and view all the answers

Which of the following materials is ductile like rocks that flow in response to stress?

<p>Clay (A)</p> Signup and view all the answers

How do brittle rocks respond to stress compared to ductile rocks?

<p>Brittle rocks fracture or break under stress. (D)</p> Signup and view all the answers

Why do materials become more brittle at lower temperatures?

<p>Because they lose flexibility and are more prone to breaking. (C)</p> Signup and view all the answers

How does the presence of water affect the brittleness of a rock?

<p>Less water makes the rock more brittle. (B)</p> Signup and view all the answers

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