Global Explorers: Our Changing World · 6th Class

Active learning ideas

Coastal Processes and Landforms

Active learning helps students visualize abstract coastal processes that occur over time. When students model erosion and deposition in a sand tray or test wave strength in a ripple tank, they connect theory to tangible evidence. These hands-on experiences make patterns visible and build foundational knowledge for analyzing real coastal features like the Cliffs of Moher or Dublin Bay.

• NCCA Curriculum Specifications
• NCCA: Primary - Natural Environments
• NCCA: Primary - Physical Features of Europe and the World

• 30–50 min
• Pairs → Whole Class
• 4 activities

Activity 01

• Problem-Based Learning
• 45 min · Small Groups

Sand Tray Modeling: Erosion and Deposition

Provide trays with sand and clay to represent coastlines. Students pour water to simulate waves, observing erosion at cliffs and deposition on beaches. Groups sketch before-and-after changes and measure sediment movement with rulers.

Explain how wave action contributes to coastal erosion and deposition.

Facilitation Tip

During the Sand Tray Modeling activity, circulate to ask students to predict where erosion will occur first and why, guiding them to adjust their models based on observations.

What to look for

Provide students with an image of a coastal landform (e.g., a cliff with a small beach at its base). Ask them to write: 1. One process that likely formed this landform. 2. One way this landform might change in the future. 3. The name of this landform.

• Analyze
• Evaluate
• Create
• Decision-Making
• Self-Management
• Relationship Skills

Activity 02

• Problem-Based Learning
• 30 min · Pairs

Landform Comparison: Image Analysis

Display photos of cliffs, beaches, spits, and bays from Irish coasts. Pairs label features, note erosion/deposition evidence, and create a Venn diagram comparing two landforms. Share findings in a class gallery walk.

Compare and contrast different coastal landforms such as cliffs, beaches, and spits.

Facilitation Tip

For the Landform Comparison activity, provide a mix of Irish and global examples so students can identify patterns in rock type and wave energy.

What to look for

Pose this question: 'Imagine you are advising a small coastal village in Ireland that is experiencing significant erosion. What are two specific actions you would recommend to protect their coastline, and why?' Facilitate a class discussion where students share and justify their ideas.

• Analyze
• Evaluate
• Create
• Decision-Making
• Self-Management
• Relationship Skills

Activity 03

• Problem-Based Learning
• 50 min · Small Groups

Design Challenge: Coast Protection

Present a scenario of an eroding Irish beach. Small groups sketch and build models using craft materials for defenses like sea walls or dunes. Groups pitch designs, explaining how they reduce wave energy.

Design a strategy to protect a vulnerable coastline from erosion.

Facilitation Tip

In the Design Challenge, encourage students to test one variable at a time, such as groyne length or vegetation density, to isolate its effect on erosion rates.

What to look for

Show students diagrams or photos of different coastal landforms (e.g., a beach, a spit, a headland). Ask them to label each landform and write one sentence describing how it was formed. This can be done on mini whiteboards or paper.

• Analyze
• Evaluate
• Create
• Decision-Making
• Self-Management
• Relationship Skills

Activity 04

• Problem-Based Learning
• 35 min · Whole Class

Wave Action Demo: Whole Class Ripple Tank

Use a shallow tank with barriers to show wave refraction around headlands. Students predict and observe erosion hotspots, then record patterns on worksheets. Discuss links to real spits and bays.

Explain how wave action contributes to coastal erosion and deposition.

Facilitation Tip

For the Wave Action Demo, have students measure ripple height and distance traveled to quantify wave energy and relate it to erosion potential.

What to look for

Provide students with an image of a coastal landform (e.g., a cliff with a small beach at its base). Ask them to write: 1. One process that likely formed this landform. 2. One way this landform might change in the future. 3. The name of this landform.

• Analyze
• Evaluate
• Create
• Decision-Making
• Self-Management
• Relationship Skills

A few notes on teaching this unit

Teachers should emphasize the role of evidence when discussing coastal processes. Encourage students to use their observations from modeling activities to explain landform development rather than relying on memorized facts. Avoid oversimplifying by noting that coastal processes vary widely; use local Irish examples to ground discussions in familiar contexts. Research shows that students grasp complex systems better when they manipulate variables and see immediate results, so prioritize activities that allow for iteration and reflection.

Students will confidently explain how waves, tides, and currents shape coastlines by describing the processes that form specific landforms. They will compare landforms using evidence from images and models, then propose thoughtful protection strategies based on observed effects. Success is seen when students justify their ideas with clear connections to erosion, transportation, and deposition.

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Watch Out for These Misconceptions

• During the Sand Tray Modeling activity, watch for students who assume waves only erode coastlines and never build them up.

  Ask students to adjust their models to show both erosion at the wave impact zone and deposition in calmer areas, such as behind a headland or in a sheltered bay. Have them describe the sediment buildup in these zones using evidence from their trays.

• During the Landform Comparison activity, watch for students who assume all coastal landforms form at the same speed everywhere.

  Guide students to compare photos of cliffs, headlands, and beaches, noting differences in rock type and wave energy. Ask them to rank the landforms by likely formation speed and justify their choices using evidence from the images.

• During the Design Challenge activity, watch for students who assume coastal erosion cannot be slowed by human actions.

  Have students test their protection strategies in their sand trays, measuring erosion before and after adding groynes or vegetation. Ask them to present their findings, explaining how their strategies reduce erosion based on their observations.

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Methods used in this brief

• Problem-Based Learning