Emergent vs Submergent Landforms

What is the difference between emergent and submergent coastlines?

• Emergent: Relative sea level falls or land rises.

• Submergent: Relative sea level rises or land sinks.

• Both are linked to long-term climate change and glacial processes.

How are raised beaches formed?

• Wave-cut platform forms at sea level.

• Relative sea level falls (or land rises due to isostatic rebound).

• Former beach becomes stranded above current sea level.

• A raised beach and fossil cliff remain.

What evidence suggests a coastline has emerged?

• Raised beaches

• Fossil cliffs

• Marine sediments above current sea level

How are rias formed?

1. River valley develops during lower sea levels.

2. Post-glacial sea-level rise floods the valley.

3. Creates a wide, branching inlet.

Example: Kingsbridge Estuary, Devon.

What are the characteristics of a ria?

• Drowned river valley

• Relatively shallow

• Irregular branching shape

• No steep glacial sides

How are fjords formed?

1. Glacier erodes a deep U-shaped valley.

2. Ice melts after glaciation.

3. Rising sea level floods the valley.

Example: Sognefjorden, Norway.

What features distinguish fjords?

Deep, Steep, U Shaped, Glacial Origin

What features distinguish rias?

Shallow, Gradual, V Shaped, River Origin

Why are rias and fjords considered submergent landforms?

Because they formed when sea level rose after the last glacial period and flooded existing valleys.