Geography · KS3 Y8 · Rivers & Coasts

Coastal landforms: caves to stacks

Coastal landforms: caves to stacksFree2:12Heddy Score 3 of 7, below the standard
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What you need to know

  • Caves, arches, stacks and stumps form in that order on a headland.
  • Waves bend around the headland and attack a weakness such as a crack or fault, widening it into a cave.
  • When the cave cuts right through the headland it becomes an arch.
  • The arch roof is weakened by erosion and weathering until it collapses, leaving a stack.
  • Hydraulic action and abrasion undercut the base of the stack until it falls, leaving a stump.

In this clip

Runs 2:12, from 0:03 to 2:15 of the full video.

Heddy Score3/7, Below the standard
See the seven stars
  • Trusted source · passed. The creator's own upload, live and playable here.
  • On the map · not judged yet. A teacher watched it: it mainly teaches this map topic.
  • Spec-true · not judged yet. Accurate, and right for the current UK specification.
  • Focused · passed. One idea, short enough to watch in one go.
  • Accessible · passed. Good captions, clear sound and pictures.
  • Safe for children · not judged yet. Right for 11 to 16 year olds, with no sales pitch.
  • Proven · not judged yet. Earned from our students: they learn from it, find it helpful and watch it to the end.
★ passed · ☆ pending · ✕ failed
Our students

Not enough students yet

Our own students' answers. These are what move ★7 Proven.
On YouTube

228K views · 1.82K likes · Geographer Online 33.4K subscribers

As reported by YouTube on 2026-11-02. Not part of the Heddy Score.
How the Heddy Score works

Why we picked it

A clear labelled-diagram explanation of the full erosion sequence from crack to stump, ideal for exam diagram answers.

Geographer Online on YouTubechecked 2026-10-22

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