2B.6c

Question 1

Explain talus scree slopes

Answer 1

• The angular blockfall debris accumulates at the cliff foot to form a talus scree slope, a fan shaped mound of material.
• Undercutting of cliffs by the creation of wave-cut notches can lead to large falls and talus scree slopes at their base.
• A talus scree slope has a slope angle of 34-40’ (larger fragments maintain a steeper angle of rest due to friction between rocks)

Question 2

State the landform left behind by rotational slumping

Answer 2

• Rotaional slumping exposes a rotational scar
• A rotational scar is a fresh, curved, unweathered and unvegetated rock surface on the cliff face.
• The detached slope section, often with vegetation intact on top of the slump, forms a beach or terraced cliff profile

Question 3

State the landform left behind by mudflows

Answer 3

often occur when water is channelled locally to saturate the soil – thus creating rills (eroded gullys) and lobes (front edge of deposition).

Question 4

State three distinctive landforms at the coast

Answer 4

talus scree slopes, rotational scars, terraced cliff profiles

Question 5

Landform left by blockfalls

Answer 5

– Debris material tends to stay in larger sizes - often leaves a clean scar above along the failure line (e.g bedding plane)