Ch 11 ESR - Mountain Building

Once their strength is exceeded, rocks near the surface behave like

• clay

• metal

• glass

At depth, where temperatures and pressures are high, rocks exhibit

• brittle deformation

• ductile deformation

Which stress causes rocks to be pulled in opposite directions, hence may cause them to stretch?

• Tensional stress

• Compressional stress

• Shear stress

Based on the principles of isostasy, which of the following is false?

• Thick sections of crustal material float higher than thinner slabs.

• A mountain will ultimately be eroded to near sea level.

• The concept of a floating crust in gravitational balance is isostasy.

• A thickened block would sink and the top would be lower than before.

Which of the following statements is true for folding in sedimentary rock layers?

• Upfolds are called synclines.

• Symmetrical folds are called monoclines.

• Downfolds are called synclines.

• Overturned folds have no trough.

Faults are generally closely associated with

• monoclines

• anticlines

• synclines

• symmetrical folds

The movement of crust in a normal fault is

• Mostly vertical direction

• Mostly horizontal direction

• Only vertical direction

• Equally in vertical and horizontal direction

Faults that occur due to tensional stress are called

• Normal

• Reverse

• Thrust

• Strike-slip

Which of the following can be produced at an ocean continental convergence?

• continental volcanic arc

• volcanic island arc

• mid-ocean ridge

• graben bounded by horsts

An accumulation of different sedimentary and metamorphic rocks combined with scraps of ocean crust are called

• dome

• volcanic island arc

• accretionary wedge

• fault-block mountain