Geologic Time and Rock Behavior Across Eons

The video explores geologic time, focusing on the four eons: Hadean, Archean, Proterozoic, and Phanerozoic. It delves into rock deformation, explaining mechanical properties like stress, strain, and Young's modulus. The video discusses rock competence, influenced by mineral composition, temperature, and pressure. It covers deformation types: brittle, elastic, plastic, and viscous, highlighting their occurrence in different crustal depths and conditions.

Which of the following eons is the most recent in geologic time?

• Hadean

• Proterozoic

• Archean

• Phanerozoic

What term describes the resistance of a material to flow?

• Elasticity

• Viscosity

• Density

• Rigidity

Which type of stress acts parallel to a surface?

• Tensile stress

• Compressive stress

• Normal stress

• Shear stress

What is Young's modulus used to represent?

• The density of a material

• The color of a mineral

• The stress-strain relationship of a material

• The temperature of a material

Which type of rock is considered incompetent?

• Granite

• Clay

• Feldspar

• Garnet

What type of deformation occurs when rocks break instead of bend?

• Viscous deformation

• Plastic deformation

• Elastic deformation

• Brittle deformation

In which deformation mechanism do materials not revert to their original shape after stress is removed?

• Brittle deformation

• Viscous deformation

• Plastic deformation

• Elastic deformation

Where are the largest earthquakes expected to occur?

• In the mantle

• In the lower crust

• In the oceanic crust

• In the upper crust

What happens to a rock's strength as pressure and temperature increase?

• It increases

• It decreases

• It remains the same

• It fluctuates

Which type of deformation is most common in the upper 10 kilometers of the crust?

• Viscous deformation

• Plastic deformation

• Brittle deformation

• Elastic deformation