Activity 01
Wave Tank Demo: Erosion Rates
Small groups build sand or clay cliffs in shallow trays. Generate waves by pouring water from jugs, adding pebbles for abrasion in one tray. Time erosion until collapse and record differences, then share findings.
How does the sea hit the land?
Facilitation TipDuring Wave Tank Demo, circulate with a timer to prompt students to record observations every 30 seconds and compare before-and-after photos to reinforce gradual change.
What to look forProvide students with two images: one showing a smooth, sandy beach and another showing a rugged, rocky coastline with sea stacks. Ask them to write one sentence explaining which image best represents coastal erosion and name one process responsible for its formation.
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Activity 02
Photo Sort: Coastal Processes
Provide images of Irish cliffs, bays, arches, and stacks. Small groups sort and label with process cards like hydraulic action or attrition. Groups present one feature to class with evidence from photos.
What are cliffs and how does the sea make them?
Facilitation TipFor Photo Sort, group students to sort images by process type and defend their choices using vocabulary from the overview.
What to look forDisplay a diagram of a cliff with labels for swash, backwash, and an area of undercutting. Ask students to verbally explain to a partner what is happening at the undercut area and what will likely happen next.
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Activity 03
Sketch Map: Local Coast Features
Whole class visits school beach or uses Google Earth for Irish coast. Students sketch key features and annotate erosion evidence. Debrief with paired talk on predictions for future changes.
What other things can the sea do to the land?
Facilitation TipWhen students Sketch Maps, remind them to include labels for features like headlands, bays, and cliffs and to draw arrows showing longshore drift.
What to look forPose the question: 'If you were a coastal planner for a town facing a rapidly eroding cliff, what are two natural processes you would need to understand to propose a solution, and why?' Facilitate a brief class discussion on their responses.
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Activity 04
Clay Model: Headland Erosion
Pairs sculpt headlands from clay or playdough with varying rock layers. Drip water to simulate waves, noting faster erosion in soft areas. Compare models before and after in class gallery walk.
How does the sea hit the land?
Facilitation TipIn the Clay Model activity, ask students to predict which part of their headland will erode fastest before they begin testing, then compare predictions to results.
What to look forProvide students with two images: one showing a smooth, sandy beach and another showing a rugged, rocky coastline with sea stacks. Ask them to write one sentence explaining which image best represents coastal erosion and name one process responsible for its formation.
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Generate Complete Lesson→A few notes on teaching this unit
Teachers should avoid rushing to definitions before students experience the processes. Start with observable phenomena, then introduce terms as students describe what they see. Use guided questions like 'What is happening at the base of the cliff?' to help students articulate erosion mechanics before naming them. Research shows modeling and repeated observation reduce misconceptions about sudden versus gradual change.
Students will explain erosion and deposition using correct terminology, identify landforms created by wave action, and trace material movement along the coast. Evidence of learning includes labeled diagrams, measured erosion rates, and discussion that links processes to landforms.
Watch Out for These Misconceptions
During Wave Tank Demo, watch for students who believe cliffs form from one big storm.
Have students run three timed erosion rounds, photographing the cliff face after each round to show incremental change over time. Use a class timeline to mark measurements and ask, 'What would happen if we ran this for 10 more rounds?' to reinforce gradual processes.
During Photo Sort, watch for students who state that the sea only builds beaches.
Ask groups to sort images into two piles: erosion sites and deposition sites. Then, have them draw arrows to show how material moves from one to the other, using peer teaching to clarify longshore drift and its role in beach formation.
During Clay Model activity, watch for students who assume all coastline rocks erode at the same rate.
Provide trays with different materials (e.g., soft clay, harder rock chips) and have students measure erosion depth after 10 waves. Ask, 'Which material lost the most volume? Why might softer rock form bays?' to link observations to landform creation.
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