Good Learning Co.
SavannahYear 8
← Geography
GeographyChanging landscapes: rivers, coasts and ice30 min★★★ difficulty

How waves shape a coastline

A coastline is never finished. Geology, wave energy and sediment movement continually redraw the boundary between land and sea.

Part of your national curriculum
  • Human and physical geography: Understand how geographical processes interact to create distinctive human and physical landscapes that change over time
  • Human and physical geography: Understand rivers, coasts and glaciation and the physical processes that give rise to landscapes, and how they change over time

Lesson overview

What you'll learn in this lesson

Understand rivers, coasts and glaciation and the physical processes that give rise to landscapes, and how they change over time

Key learning points

  • • Why headlands and bays form
  • • Cliffs, caves, arches and stacks
  • • Moving sediment
  • • Managing change

This lesson at a glance

  • 30 minutes
  • 15 parts to scroll through
  • 3 quick checks
  • Marked quiz at the end
  • Gentle pace: short sittings with pauses

Words to know

riverscoastsglaciationphysicalprocesses

Scroll down — the lesson carries on below

Part 1 of 15 · Discover7%
1

Watch & discover

Part 1 of 15

Watch first

How waves shape a coastline

An English teaching video on this topic from Oxford Education. Watch it, then scroll down for the lesson.

In a nutshell

Understand rivers, coasts and glaciation and the physical processes that give rise to landscapes, and how they change over time

2

Learning cycle

Part 2 of 15

Learning cycle 1 of 2

Part 1 · Why headlands and bays form

A short piece of teaching, then a check to make sure it has landed.

3

Explore the idea

Part 3 of 15

Learn

Why headlands and bays form

On a discordant coast, alternating bands of hard and soft rock meet the sea. Softer rock erodes more quickly to form a bay, while harder rock remains as a headland. Wave refraction concentrates energy on headlands and spreads it through sheltered bays.

4

Explore the idea

Part 4 of 15

Learn

Cliffs, caves, arches and stacks

Hydraulic action and abrasion enlarge a weakness in a headland into a cave. Continued erosion can break through to form an arch. Weathering and gravity weaken the roof until it collapses, leaving a stack and eventually a low stump.

5

Quick check

Part 5 of 15

Quick check

Why does a bay form in softer rock?

6

Quick check

Part 6 of 15

Quick check

What is the correct sequence?

7

Reset break

Part 7 of 15

Pause

That's sitting 1 of 2 done

Stretch, get a drink, look out of the window. There is no timer and nothing is counting down — your place is saved, so you can come back in five minutes or tomorrow.

Stop here for now
8

Learning cycle

Part 8 of 15

Learning cycle 2 of 2

Part 2 · Moving sediment

A short piece of teaching, then a check to make sure it has landed.

9

Explore the idea

Part 9 of 15

Learn

Moving sediment

When waves approach at an angle, swash carries sediment diagonally up the beach and backwash pulls it straight downslope. This longshore drift moves material along the coast. Where the coast changes direction, deposition can build a spit with a sheltered salt marsh behind it.

10

Explore the idea

Part 10 of 15

Learn

Managing change

Sea walls and rock armour protect particular places but are costly and can shift erosion along the coast. Beach nourishment and managed realignment work more closely with natural processes. A sound decision compares cost, lifespan, environmental effects and who benefits.

11

Quick check

Part 11 of 15

Quick check

Longshore drift moves sediment because…

12

Challenge round

Part 12 of 15

Game · Sort it

Which of these are true?

Drag each card into the right column. Tap a card first if dragging is fiddly.

True

Not true

13

Challenge round

Part 13 of 15

Game · Fill the gaps

Finish the sentences

Choose the word that belongs in each gap.

Beach nourishment and managed realignment work more closely with natural ____.

14

Mastery quiz

Part 14 of 15

Marked quiz

End of lesson quiz: How waves shape a coastline

3 questions, marked with the reasoning shown. No timer.

  1. 1. Why does a bay form in softer rock?

  2. 2. What is the correct sequence?

  3. 3. Longshore drift moves sediment because…

15

Lesson round-up

Part 15 of 15

Lesson round-up

Ready when you are

Quiz score

Not sat

Games

Not played

Points this lesson

0

Best run

0 in a row

Luna: 0 out of 3 on the practice checks. Only if you feel up to it — one more?

Ask Luna

Do the work

Your written work for this lesson

This is the part you'd do in your book at school. Pick the pieces below, write here or on paper, and photograph anything you draw or work out.

Case study

Flooding on the River Calder

The town of Harbrook sits where a steep valley opens onto a flat floodplain. In December 2015, 120 mm of rain fell in 36 hours onto ground that was already saturated. The river rose 2.4 m in five hours, and 380 homes and 54 businesses flooded. Two roads and the railway closed for eleven days.

Geographers pointed to physical causes — steep slopes, impermeable rock, heavy rainfall — and human causes: moorland drained upstream, new housing built on the floodplain, and drains designed for smaller storms.

Since then the town has planted 40 hectares of woodland upstream, built leaky dams in small streams, and raised flood walls to 1.8 m. In the storm of 2020 the peak river level was 0.3 m lower and 40 homes flooded, not 380.

Written for Good Learning Co.

Reading questions

  1. List two physical and two human causes of the 2015 flood.
  2. Explain how planting woodland upstream lowers the river's peak level.
  3. Using the figures, judge how successful the scheme has been. Quote data in your answer.

  • Case study notes

    Writing

    Write the place, the facts and the figures from this lesson so you can revise them later.

    Half a page

  • Explain answer

    Writing

    Answer in full sentences, giving causes and effects. Use one figure or place name as evidence.

    8–10 sentences

  • Map or sketch

    Diagram

    Draw the map, cross-section or field sketch with a key, title and labels, then photograph it.

    1 map with a key

  • Data work

    Working out

    Plot your figures as a graph on paper and write one sentence about the pattern.

    1 graph + 1 sentence

Saved as you type.

Part 1 of 15 · Watch & discover

How this is going

  • Not looked at yet

    Understand how geographical processes interact to create distinctive human and physical landscapes that change over time

  • Not looked at yet

    Understand rivers, coasts and glaciation and the physical processes that give rise to landscapes, and how they change over time

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