Overview of Geologic Structures Part 1: Rock Deformation, Stress and Strain

The video tutorial covers the geologic time scale, focusing on the four eons: Haitian, Archaean, Proterozoic, and Phanerozoic. It explains how rocks deform over time due to mechanical properties and environmental conditions like pressure and temperature. The concepts of stress and strain are introduced, along with Young's modulus, which describes material response to stress. The tutorial also discusses rock competence and the four deformation mechanisms: brittle, elastic, plastic, and viscous. Finally, it explores the causes of earthquakes and the role of plastic deformation in the Earth's crust and mantle.

Which of the following eons is NOT part of the geologic time discussed?

• Haitian

• Archaean

• Proterozoic

• Cenozoic

What happens to rocks at high temperatures and pressures similar to those in the mantle?

• They behave like Silly Putty

• They become magnetic

• They become more rigid

• They shatter easily

What is the term used to describe a material's resistance to flow?

• Viscosity

• Conductivity

• Elasticity

• Density

Which type of stress acts parallel to a surface?

• Normal stress

• Shear stress

• Compressive stress

• Tensile stress

What does Young's modulus represent in the context of stress and strain?

• The temperature of a material

• The viscosity of a material

• The elasticity of a material

• The density of a material

Which type of deformation is most common at the Earth's surface?

• Brittle deformation

• Elastic deformation

• Viscous deformation

• Plastic deformation

What type of deformation occurs when atomic bonds are broken under stress?

• Plastic deformation

• Viscous deformation

• Brittle deformation

• Elastic deformation