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Difficulty: EasyOceans, Coastal Processes, and Coastal Landforms

Coastal landforms evolve through continuous wave processes such as hydraulic action and abrasion along headlands. Which of the following features is formed primarily by coastal marine erosion?

  1. A sea stackAnswer
  2. B
    An oxbow lake
  3. C
    A scree slope
  4. D
    A marble deposit

Answer

A sea stack is formed primarily by coastal marine erosion.
A sea stack is formed by continuous hydraulic action and abrasion on a rocky headland. Wave action undermines caves on both sides of a headland to form an arch, which eventually collapses under gravity, leaving behind a freestanding pillar of rock.

Step-by-Step Solution

1
Identify the process responsible for forming each landform option.
Marine erosion operates along coastlines, while rivers create fluvial landforms, gravity creates slope landforms, and heat/pressure form rocks.
Categorizing features by their main geomorphic agent isolates the correct coastal process.
2
Evaluate the coastal erosional sequence.
Waves attack headland weakness →\rightarrow sea cave →\rightarrow sea arch →\rightarrow arch collapse leaves an isolated pillar called a sea stack.
Sea stacks represent a direct stage in coastal headland erosion.

Key Concept

Coastal Erosional Landforms
Estimated Time:45s
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Topics

Oceans, Coastal Processes, and Coastal Landforms

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