Exam 15: Geologic Structures

The fact that a rock is folded or bent shows that it behaved as a _____ material.

Sheet jointing is a type of jointing due to compressional stress.

______ is the compass direction of a line formed by the intersection of an inclined plane and an imaginary horizontal plane.

Dip angle is measured downward from the horizontal plane to the bedding plane.

The San Andreas Fault system can be described as _________.

A rock that behaves in a(n) ____ manner will bend under stress and does not return to its original shape.

Where joints are oriented approximately parallel to one another a _____ can be defined.

_____ are fractures in bedrock along which sliding movement has taken place.

Rifts are associated with converging plate boundaries.

The angle of dip is measured relative to _______.

A syncline is a fold shaped like an arch, with the oldest rocks in the center.

For many geologists an active fault is one along which movement has taken place in the during the last ________ years.

A(n) _____ represents a vertical slice through the Earth.

A rock that behaves in a ductile manner will bend under stress but will not return to its original shape.

A geologic cross section represents a vertical slice through a portion of the Earth.

A(n) ____ trap is one of the best structures for holding oil.

In a _____ fault the hanging wall block moves down relative to the footwall block.

Rocks typically exhibit _____ behavior at or near the surface where temperatures and pressures are low.

In a normal fault, the hanging-wall block has moved ______ relative to the footwall block.

The axial plane divides a fold into top and bottom portions.