FREE ASBOG Drainage Patterns/Stream Types Questions and Answers

Question 1

In areas where there are numerous flaws

Accepted Answer

Rectangular Drainage Pattern

Answer

A rectangular drainage pattern develops in areas where the underlying bedrock is fractured or faulted, creating a grid-like network of weaknesses. Streams follow these paths of least resistance, resulting in sharp, angular bends in their courses. This pattern is indicative of strong structural control over the drainage.

Question 2

a drainage pattern that may form on uniform rock and has a shape matching the pattern created by tree branches or leaf veins

Accepted Answer

Dendritic Pattern

Answer

A dendritic drainage pattern is characterized by a tree-like branching network of streams, resembling the veins of a leaf. This pattern typically forms on uniformly resistant rock where there is no structural control over the drainage direction. It is the most common type of drainage pattern found in nature.

Question 3

"Mount in the center
The streams radiate from a central high point in a radial drainage system. Typically, volcanoes have excellent radial drainage. Domes and laccoliths are additional geological structures on which radial drainage frequently occurs. The drainage on these objects may display a variety of radial patterns."

Accepted Answer

Radial Drainage Pattern

Answer

A radial drainage pattern is characterized by streams flowing outwards in all directions from a central elevated point, such as a volcano, dome, or laccolith. This pattern is formed as water drains away from a topographic high. It is a distinctive pattern often associated with conical landforms.

Question 4

a stream that only occasionally flows in the area during and after a time of rainfall

Accepted Answer

Ephemeral Stream

Answer

An ephemeral stream is one that flows only occasionally, specifically during and immediately after periods of rainfall or snowmelt. Its channel is typically above the water table and remains dry for most of the year. These streams are common in arid and semi-arid regions.

Question 5

continuous flow of water

Accepted Answer

Perennial Stream

Answer

A perennial stream is characterized by a continuous flow of water throughout the entire year, even during dry seasons. Its channel is typically at or below the water table, sustained by groundwater discharge. These streams are a reliable source of water and are common in humid climates.

ASBOG - Association of State Boards of Geology Practice Test

ASBOG - Association of State Boards of Geology Practice Test

FREE ASBOG Drainage Patterns/Stream Types Questions and Answers