Exploring River Landforms: Erosion and Deposition

The video explains various river landforms formed by erosion, deposition, or both. It covers the formation of waterfalls, rapids, potholes, meanders, oxbow lakes, braided rivers, floodplains, levees, and deltas. Each landform is described in terms of the processes involved, such as erosion, deposition, and the interaction of river currents with different types of rock and sediment.

What causes a waterfall to form in a river?

• A sudden increase in water volume

• A sudden change in the gradient of the river

• A decrease in water speed

• The presence of a large rock in the river

Tags

NGSS.MS-ESS2-4

What are rapids primarily composed of?

• Slow-moving water and soft rock

• Turbulent water and steep sections of hard rock

• Calm water and sandy riverbeds

• Deep pools and shallow riffles

How do potholes form in a riverbed?

• By the deposition of large rocks

• By the flow of water over a flat surface

• By the circular motion of water called eddy currents

• By the accumulation of sediment

Where do meanders typically occur in a river?

• In the upper section

• In the middle and lower sections

• At the river mouth

• In the delta region

What is an oxbow lake?

• A lake formed by volcanic activity

• A lake formed by glacial activity

• A horseshoe-shaped lake separated from a river

• A lake formed by a dam

What causes a river to braid?

• High water velocity

• A large amount of eroded sediment

• The formation of an oxbow lake

• The presence of a waterfall

What are floodplains?

• Large flat areas of land on either side of a river

• Raised embankments formed by sediment

• Steep-sided valleys

• Deep pools in a river

Tags

NGSS.MS-ESS2-2

NGSS.MS-ESS2-4

What are levees?

• Natural raised embankments formed as a river overflows its banks

• Deep sections of a river

• Curved sections of a river

• Flat areas of land on either side of a river

Tags

NGSS.MS-ETS1-2

What is the primary factor in the formation of deltas?

• High water velocity

• The rate of deposition exceeding the rate of sediment removal

• The formation of an oxbow lake

• The presence of a waterfall

Which delta shape is characterized by fingers of deposition extending into the sea?

• Bird's Foot Delta

• Fan Delta

• Arcuate Delta

• Cuspid Delta