geol 12 march

What are the three main regimes of stress and strain in geology?

• tensional, rotational, and compressional
• shear, elastic, and plastic
• compressional, isotropic, and dynamic
• Compression, Tension, Shear

What geological structure forms when rocks are squeezed together?

• Fault
• Volcano
• Faulting

• Sedimentary Layer

What is the elevated rock body formed by tension called?

• Horst

• plateau
• fault
• rift

What is the subducted, lower rock body formed by tension called?

• mantle
• crust
• Graben

• plate

What type of stress causes rock bodies to move parallel but in opposite directions?

• Tensile stress
• Shear

• Compressive stress
• Elastic stress

What are “suture zones” also referred to as?

• transform boundaries
• fault lines
• Shear zones

• subduction zones

What geological feature forms when deformation appears in rock fabric in a shear zone?

• Schist
• Basalt
• Foliation

• Granite

What does foliation indicate about rock movement?

• Foliation shows the rock has been exposed to high temperatures only.
• Foliation indicates the rock has cooled rapidly.
• Foliation suggests the rock has remained stationary throughout its formation.
• The direction of force and movement of tectonic plates over time

How do brittle rocks respond to stress?

• Brittle rocks absorb stress without any change.
• They break immediately

• Brittle rocks bend and deform under stress.
• Brittle rocks melt when subjected to high stress.

What is the characteristic of plastic deformation in rocks?

• Plastic deformation occurs only at low temperatures.
• Rocks withstand stress but do not return to their original shape

• Rocks always fracture before any deformation occurs.
• Rocks can only deform elastically under low stress.