River Erosion and Landforms Concepts

This lesson covers the features formed in the mature stage of a river, including gorges, canyons, arroyo fans, river benches, and river terraces. It explains how these features are formed through processes like vertical erosion, sediment deposition, and differential erosion. The lesson provides diagrams to illustrate these concepts.

What is the primary process involved in the formation of features in the mid-river stage?

• Chemical weathering

• Lateral erosion

• Vertical erosion

• Deposition

What characterizes gorges and canyons?

• Deep and narrow valleys with steep sides

• Flat plains

• Mountainous regions

• Wide and shallow valleys

How do gorges and canyons primarily form?

• Due to deposition

• Through lateral erosion

• By chemical weathering

• Because of vertical erosion

What shape do alluvial fans resemble?

• A circle

• A triangle

• A square

• A fan

When do alluvial fans typically form?

• When a river gains velocity

• When a river loses velocity

• In the upper course of a river

• During a flood

What causes the formation of river benches?

• Uniform erosion

• Differential erosion

• Chemical weathering

• Sediment deposition

What is the appearance of river benches?

• Steep cliffs

• Deep valleys

• Flat surfaces like steps

• Circular mounds

What do river terraces resemble?

• Plains

• Terraces

• Mountains

• Valleys

Where are river terraces typically found?

• In the middle of the river

• In the ocean

• On either side of the river

• At the river's source

What remains standing after the flood plain in river terraces?

• Water

• Heaps of deposits

• Rocks

• Trees