River Course Quiz

What is the primary erosion process in the upper and middle course of a river?

• Traction

• Attrition

• Hydraulic action

• Corrosion

How are meanders formed in a river?

• Meanders are formed in a river due to gravitational pull.

• Meanders are formed in a river due to erosion and deposition processes.

• Meanders are formed in a river due to magnetic fields.

• Meanders are formed in a river due to volcanic activity.

What is the formation process of oxbow lakes in a river?

• Oxbow lakes are formed by glacier movement

• Oxbow lakes are formed by underground springs

• Oxbow lakes are formed when a meander in a river is cut off, usually during a flood, creating a U-shaped body of water separate from the main river channel.

• Oxbow lakes are formed by volcanic activity

Explain how waterfalls are formed in the upper course of a river.

• Waterfalls are formed in the upper course of a river due to lack of water flow

• Waterfalls are formed in the upper course of a river due to excessive sedimentation

• Waterfalls are formed in the upper course of a river due to volcanic activity

• Waterfalls are formed in the upper course of a river due to differential erosion between hard and soft rock layers, creating a step in the riverbed where water plunges downwards, leading to the formation of a waterfall.

Describe the formation of V-shaped valleys in a river.

• V-shaped valleys are a result of tectonic plate movement

• V-shaped valleys in a river are formed through erosion by the flowing water over time, cutting down into the land and creating a V-shaped profile.

• V-shaped valleys are formed by volcanic activity

• V-shaped valleys are created by wind erosion

Which erosion process is responsible for creating deep channels in the riverbed?

• Corrosion

• Abrasion

• Hydraulic action

• Attrition

What causes the outer bank of a meander to erode?

• Higher velocity of water on the outside curve of the bend

• Lower velocity of water on the outside curve of the bend

• Presence of vegetation stabilizing the bank

• Decreased sediment load in the water

Why do oxbow lakes eventually become isolated from the main river channel?

• Fish migration prevents the oxbow lake from staying isolated.

• Human intervention creates barriers between the oxbow lake and the main river channel.

• The main river channel widens to engulf the oxbow lake.

• Sedimentation and vegetation growth further separate the oxbow lake from the main river channel.

What geological features contribute to the formation of waterfalls in a river?

• Changes in air pressure

• Variations in rock hardness and resistance to erosion

• Variations in water temperature

• Presence of aquatic plants

How does the flow of water contribute to the shaping of V-shaped valleys?

• The flow of water has no impact on valley formation.

• The flow of water causes the valley to widen.

• The flow of water erodes the sides of the valley.

• The flow of water creates flat valleys.