Science // Earth's Systems

Preventing Erosion

Compare multiple solutions designed to slow or prevent wind or water from changing the shape of the land

Ages
7 to 8
Type
Method
Builds on
1 topic
Leads to
2 topics
Standards
1 code

Quick check

If the learner sees a sandcastle being washed away by waves, can they think of ways to protect it — like building a wall or planting grass to hold the sand?

Ask this to see whether the topic is secure.

Topic // Mastery

What mastery looks like

What a learner can do once this topic is secure.
  • Describe how wind and water can change the shape of land (erosion)
  • Compare at least two design solutions for reducing erosion (e.g. retaining walls, plants, windbreaks)
  • Evaluate which solution works best based on evidence from tests or observations

Topic // Map

Where this fits

What to learn first and what this topic opens up, with the reason for each link. Required links come first.
  • RequiredMust come first
  • HelpfulHelps, but not essential

Before this

1 topic
  • Shapes of land and waterRequired

    Earth's Systems // Ages 7 to 8

    Must know about landforms before designing solutions to prevent wind/water erosion

You are here

Preventing Erosion

Ages 7 to 8 // Method

Leads to

2 topics
  • Rapid earth changesRequired

    Space Systems & Earth's History // Ages 7 to 8

    Must understand erosion before comparing fast vs slow Earth events

  • Erosion and weatheringRequired

    Earth's Systems // Ages 9 to 10

    Must understand erosion prevention before measuring weathering/erosion effects systematically

Topic // Research-informed

Teaching notes

From the Marble Skill Taxonomy. These notes have not been validated in classrooms, so treat them as a starting point for your own judgement.

The approach

For 7\u20138 year olds comparing engineering solutions that slow or prevent wind and [curriculum wording omitted; reference 2-ESS2-1]. The core target is COMPARING two or three solutions (plants/ground cover, barriers/walls, windbreaks) against EVIDENCE from a simple fair test \u2014 not opinion \u2014 and defending a claim about which works best, while recognising trade-offs and that the best choice depends on the situation.

Common misconceptions

  • 'One solution is always best' — not seeing that the right choice depends on the situation and trade-offs.
  • 'Plants cause erosion / plants are just decoration' — not recognising roots bind and hold soil.
  • 'Walls stop all erosion forever' — overlooking that barriers can fail, overtop, or shift.
  • 'You can just decide which is best by looking' — skipping the fair test/evidence.
  • 'Wind and water erosion need the same solution' — windbreaks vs water barriers suit different agents.

Useful representations

  • Side-by-side test trays: bare soil vs planted vs walled, same water poured.
  • A solutions comparison chart (solution → how it helps → how well it worked).
  • Before/after images of a slope with and without protection.
  • Model barriers: mini retaining wall, plant roots, windbreak hedge.

Teaching practices

  • Ground the problem first: show wind/water carrying soil away, so the solutions have a purpose.
  • COMPARE at least two or three solutions (plants, barriers/walls, windbreaks) rather than studying one — comparison is the learning target.
  • Judge solutions from EVIDENCE — a simple fair test (same slope, same water, different protection) or observation — not opinion.
  • Surface trade-offs: no single solution is always best; which wins depends on the situation (slope, wind vs water, cost/effort).
  • Have children make and defend a claim about which solution works best, citing their evidence.

Activities to try

  1. 1

    Erosion-defence fair test: bare vs planted vs walled

    Why it works: You judge which solution works best from evidence in a fair comparative test \u2014 keeping everything the same except the solution \u2014 rather than deciding by belief or by guessing from how a solution looks before testing.

    1. First watch or recall how wind and water carry soil away from a slope, so the solutions have a clear purpose.
    2. Set up three identical sloped trays of soil: one bare, one covered with living ground cover such as grass/moss (the cover shields the soil surface and roots, where present, bind it), one backed by a small retaining wall.
    3. Pour the SAME amount of water from the SAME height over each tray, and catch the runoff/soil in a tray beneath each.
    4. Measure or compare how much soil each slope lost (e.g. read a soil-loss catch tray or meter) and rank the three trays from least to most soil lost, using the bare tray as the no-protection comparison.
    5. Name which solution worked best and point to the evidence you saw or measured to justify it.
  2. 2

    Which solution for THIS situation? Surfacing trade-offs

    Why it works: There is rarely one perfect solution: the best choice depends on the situation (slope vs flat, wind vs water, cost/effort), and solutions have trade-offs; some solutions (like ground cover/plants) can help against more than one agent.

    1. Compare a rainy slope scenario with a windy flat field scenario.
    2. Decide which solution suits each situation: e.g. a windbreak (hedge/fence) to slow wind on the flat field, or a wall on a water slope \u2014 noting that plants/ground cover help reduce BOTH wind and water erosion because their roots bind the soil and the cover shields the surface.
    3. Explain why one solution can beat another when the situation changes (water pooling/overtopping a wall, roots binding soil, wind vs water).
    4. Consider cost/effort trade-offs for a site (e.g. 'the wall costs more \u2014 is it worth it here?') and justify your pick.
  3. 3

    Reading and organising the comparison evidence

    Why it works: Organising results into a comparison (solution \u2192 mechanism \u2192 how well it worked) lets you reason clearly about which solution wins and why.

    1. Match each solution to how it helps (plants/roots \u2192 bind and hold soil, and the cover shields the surface; wall/terrace \u2192 block or hold back soil and water; windbreak \u2192 slow the wind).
    2. Sort solutions by which eroding agent(s) they suit, remembering some solutions help against more than one.
    3. Read a results chart (solution \u2192 how it helps \u2192 how much soil lost) and identify which slope lost the least soil.
    4. Build a comparison chart from your own test results and use it to defend your claim.

Topic // Standards

Curriculum standards

Codes for the curriculum statements this topic maps to. Each publisher owns its standard text.
Next Generation Science Standards (NGSS) K-5
2-ESS2-1

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