ASBOG Geomorphology and Quaternary Geology 4

Question 1

Isostatic rebound (glacial isostasy) refers to:

Accepted Answer

The upward movement of the crust after glacier removal

Answer

Isostatic rebound is the upward rise of Earth's crust after the removal of glacial ice load, a process still ongoing in Scandinavia and Canada.

Question 2

Which feature is characteristic of karst topography?

Accepted Answer

Sinkholes, caves, and disappearing streams

Answer

Karst topography develops on soluble rocks like limestone and is characterized by sinkholes, caverns, springs, and disrupted surface drainage.

Question 3

A kettle hole is formed when:

Accepted Answer

A buried block of glacial ice melts, causing the overlying sediment to collapse

Answer

Kettle holes form as depressions in glacial outwash plains when stagnant ice blocks buried by sediment melt out.

Question 4

What does a negative or falling stream gradient indicate in longitudinal profile analysis?

Accepted Answer

A knickpoint may be present due to differential resistance or base level change

Answer

A steepened reach or knickpoint in a stream's longitudinal profile indicates differential erosion, resistant rock, or upstream migration of a base-level change.

Question 5

The Milankovitch cycles that drive glacial-interglacial cycles include all of the following EXCEPT:

Accepted Answer

Solar luminosity changes (~11-year sunspot cycle)

Answer

Milankovitch cycles involve eccentricity, obliquity, and precession of Earth's orbit and axial tilt, not short-term solar luminosity cycles.

ASBOG - Association of State Boards of Geology Practice Test

ASBOG - Association of State Boards of Geology Practice Test

ASBOG Geomorphology and Quaternary Geology 4