River Landforms and Their Characteristics

The video explains how landforms are shaped by external forces, focusing on the role of water in erosion, transportation, and deposition. It details the journey of a river from its upper course in the mountains, through the middle course in the plains, to the lower course where it forms deltas. Key features like canyons, waterfalls, floodplains, and oxbow lakes are discussed, illustrating the dynamic processes that shape the Earth's surface.

What are the main external forces that modify landforms?

• All of the above

• Moving ice

• Heat and cold

• Wind and water

In the upper course of a river, what is the primary action performed by the river?

• Sedimentation

• Erosion

• Transportation

• Deposition

What is a canyon?

• A mountain peak

• A flat plain

• A wide and shallow valley

• A deep and narrow valley with steep sides

How is a waterfall typically formed?

• By the river flowing over hard rocks

• By the river flowing over soft rocks

• By the river flowing over a flat plain

• By the river flowing through a forest

What happens to a river's speed as it enters the plains?

• It remains constant

• It decreases

• It stops completely

• It increases

What is a floodplain?

• A flat region formed by river deposits

• A steep valley

• A desert area

• A mountain range

What is an oxbow lake?

• A lake formed by a river bend

• A lake formed by a glacier

• A lake formed by a volcano

• A lake formed by a meteor impact

What is the main function of a river as it approaches its mouth?

• Deposition

• Evaporation

• Transportation

• Erosion

What is a delta?

• A desert area

• A deep valley

• A mountain peak

• A triangular region at a river's mouth

Which is the largest delta in the world?

• Mississippi Delta

• Ganga-Brahmaputra Delta

• Nile Delta

• Amazon Delta