Isostatic Uplift and River Dynamics

The video tutorial introduces isostatic processes, explaining how land rises or falls relative to sea level due to the addition or removal of ice sheets. It discusses the impact of glaciers during the Ice Age, causing land to sink and later uplift as ice melts. The tutorial explores how these processes affect rivers, leading to river rejuvenation, formation of nick points, and river terraces. The lesson concludes with a brief overview of upcoming topics.

What is the primary cause of land rising or falling in isostatic processes?

• Earthquakes

• Addition or removal of ice sheets

• Volcanic eruptions

• Tectonic plate movements

How do glaciers affect the lithosphere during the Ice Age?

• They cause the lithosphere to expand

• They have no effect on the lithosphere

• They cause the lithosphere to become more rigid

• They cause the lithosphere to sink slightly

What happens to the lithosphere when the ice sheets melt?

• It becomes more dense

• It sinks further

• It gradually uplifts back to its original state

• It remains unchanged

What is river rejuvenation?

• The process of a river drying up

• The river changing its course

• The river gaining a new ability to erode

• The river becoming shallower

What is a nick point in a river?

• A point where the river widens

• A point where the river dries up

• A rapid or small waterfall

• A point where the river splits

How does isostatic uplift affect the river's speed?

• It causes the river to flow in reverse

• It has no effect on the river's speed

• It slows the river down

• It makes the river travel faster

What happens to the old river profile after isostatic uplift?

• It forms a new river profile

• It becomes a new river

• It remains unchanged

• It disappears completely

What are river terraces?

• Flat areas on the riverbank

• Steps in the land representing old river levels

• Narrow sections of the river

• Deep pools in the river

How are river terraces formed?

• By tectonic shifts

• By isostatic uplift and river erosion

• By human intervention

• By volcanic activity

What is the result of a river being rejuvenated multiple times?

• It creates a river valley with step sides

• It stops flowing

• It becomes a lake

• It forms a single terrace