Geology102:Quiz-Unit09

Which type of stress involves forces pulling in opposite directions, resulting in stretching and thinning of rocks?

• Compressional stress

• Tensional stress

• Shear stress

• Brittle stress

What is the term for a change in shape that is reversible after stress is released?

• Elastic deformation

• Ductile deformation

• Brittle deformation

• Fracture

What factor increases the ductility of a rock?

• Increase in temperature

• Increase in strain rate

• Increase in rock strength

• Decrease in temperature

How is the "strike" angle measured on a geological map?

• By the depth of the rock layer

• By the angle with respect to true north or south

• By the color of the rock

• By the temperature of the area

What are geologic folds?

• Layers of rock that are curved or bent

• Layers of rock that are flat and unbent

• Layers of rock that are broken into pieces

• Layers of rock that are melted and reformed

What type of deformation allows folds to occur?

• Ductile deformation

• Brittle deformation

• Elastic deformation

• Plastic deformation

What causes a basin to accumulate more sediment?

• Erosion of the center part

• Weight of the sediment causing subsidence

• Formation of reefs

• Upwarping of rock beds

What is a fault in geological terms?

• A place where brittle deformation occurs between two blocks of rocks

• A type of rock formation found in volcanic areas

• A sedimentary layer formed by erosion

• A type of mineral deposit found in caves

Where do normal faults and tensional forces commonly occur?

• At convergent plate boundaries

• At divergent plate boundaries

• In the middle of tectonic plates

• At transform plate boundaries

What is the term for the motion when the block on the opposing side of the fault moves left relative to the observer's block?

• Dextral motion

• Sinistral motion

• Lateral motion

• Vertical motion