Exam 6: Geologic Structures

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

Stress is ______.

An anticline is a fold shaped like a(n)____ with the oldest rock in the center of the fold.

A ______ stress is caused by forces pulling away from one another.

A(n)_____ is a structure in which beds dip away from a common central point,and the oldest rocks are found in the center.

All joints are a consequence of tectonic stress.

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

A thrust fault is a reverse in which the dip of the fault plane is at a low angle.

A(n)______ fault has both dip-slip and strike-slip components.

In a _____ fault,the hanging-wall block moves up relative to the footwall block.

A dome is a structure in which beds dip away from a central point.

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

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

If a bed strikes north it must ________.

The angle of dip is measured relative to _______.

Geologists sometimes find valuable ore deposits by studying the orientation of ____,fractures or cracks in a rock body along which no displacement has occurred.

A normal fault results in crustal shortening.

Strain is force per unit area.

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

The side of the fault above the inclined fault surface is the ___.