Science · 7th Grade

Active learning ideas

Designing Solutions for Pollution

Active learning works well for this topic because students need to connect abstract concepts like pollutant pathways to tangible, real-world problems. Designing, analyzing, and evaluating solutions helps students move from passive knowledge to actionable understanding. The hands-on activities make the invisible impacts of pollution visible and the science behind solutions concrete.

• Common Core State Standards
• MS-ESS3-3
• MS-ETS1-2

• 25–90 min
• Pairs → Whole Class
• 4 activities

Activity 01

• Project-Based Learning
• 90 min · Small Groups

Design Challenge: The Waterway Plastic Interceptor

Groups receive a budget, a set of materials, and a simulated waterway (a container with flowing water and floating debris). They must design, build, and test a device that captures at least 80% of floating plastic without blocking water flow or harming simulated fish. After testing, groups present their data, identify specific failure modes, and propose one design modification supported by their test results.

How can we use engineering to capture plastic before it enters the ocean?

Facilitation Tip

During the Waterway Plastic Interceptor challenge, circulate to ask guiding questions that push students to consider both the effectiveness and the unintended consequences of their designs.

What to look for

Students present their pollution mitigation designs (e.g., a poster or prototype). Peers use a rubric to evaluate each design based on criteria (e.g., effectiveness, cost) and constraints (e.g., materials used, feasibility). They provide one specific suggestion for improvement.

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

Activity 02

• Inquiry Circle
• 60 min · Small Groups

Inquiry Circle: Stormwater Runoff Analysis

Groups model a small watershed by pouring water with food coloring over a landscape model made of soil, grass patches, and impervious surfaces. They collect runoff in a clear container and measure turbidity. They then modify the landscape by adding vegetation buffer strips or settling features and retest, comparing before-and-after results to evaluate which modification most effectively reduced runoff pollutant load.

What design features make a building more energy efficient?

Facilitation Tip

For the Stormwater Runoff Analysis, provide students with a variety of mapping tools so they can explore relationships between land use and pollution pathways in detail.

What to look for

Provide students with a scenario describing a specific pollution problem (e.g., oil spill in a local bay). Ask them to list two potential criteria for a cleanup solution and two potential constraints for developing that solution.

• Analyze
• Evaluate
• Create
• Self-Management
• Self-Awareness

Activity 03

• Think-Pair-Share
• 25 min · Pairs

Think-Pair-Share: How Do We Know an Intervention Worked?

Present two data sets: air quality measurements before and after an industrial filter installation, and water quality readings upstream and downstream of a constructed wetland. Students individually identify what the data do and do not demonstrate about each intervention's effectiveness, then share their criteria for sufficient evidence with a partner before the class develops a shared standard of evidence.

How do we measure the success of an environmental intervention?

Facilitation Tip

In the Think-Pair-Share activity, assign roles to ensure both students contribute: one as the scientist explaining data and the other as the engineer proposing solutions.

What to look for

Students write down one human activity that causes air pollution and one engineering design principle that could be used to reduce it. They should also identify one potential constraint for implementing that design.

• Understand
• Apply
• Analyze
• Self-Awareness
• Relationship Skills

Activity 04

• Gallery Walk
• 35 min · Small Groups

Gallery Walk: Evaluating Real Pollution Solutions

Post case studies of four real environmental interventions: the cleanup of the Cuyahoga River in Ohio, the Los Angeles cap-and-trade program for air pollution, green roof stormwater management in Chicago, and a river plastic interception project. Each station includes data on cost, effectiveness, and trade-offs. Students annotate strengths and limitations against MS-ETS1-2 criteria.

How can we use engineering to capture plastic before it enters the ocean?

Facilitation Tip

During the Gallery Walk, give students sticky notes in two colors to mark both strengths and limitations of each solution they see.

What to look for

Students present their pollution mitigation designs (e.g., a poster or prototype). Peers use a rubric to evaluate each design based on criteria (e.g., effectiveness, cost) and constraints (e.g., materials used, feasibility). They provide one specific suggestion for improvement.

• Understand
• Apply
• Analyze
• Create
• Relationship Skills
• Social Awareness

A few notes on teaching this unit

Teachers should approach this topic by balancing scientific inquiry with engineering design, making sure students see the real-world relevance of both. Avoid presenting pollution as an abstract problem—ground discussions in local examples where possible. Research shows that when students design solutions for their own communities, engagement and retention rise. Emphasize iteration; the first solution rarely works perfectly, and that’s part of the learning process. Encourage students to critique their own and others’ work respectfully, using evidence from data and research.

Successful learning looks like students applying scientific principles to design practical solutions, justifying their choices with evidence, and critically evaluating trade-offs. They should be able to explain how pollutants move through systems and why mitigation strategies must consider multiple variables. Collaboration and iteration are key signs of engagement.

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Watch Out for These Misconceptions

• During the Waterway Plastic Interceptor design challenge, watch for students assuming pollution only affects the area where they see it.

  Use the design challenge to trace plastic pollution pathways. Provide students with real data on how plastics travel from rivers to oceans and ask them to map these routes on their design boards to visualize non-local impacts.

• During the Gallery Walk evaluating real pollution solutions, listen for students believing that meeting legal standards means an environment is safe.

  During the Gallery Walk, have students examine case studies of solutions that met legal standards but still caused ecological harm, such as the Chesapeake Bay cleanup efforts. Ask them to identify gaps between compliance and ecological health using the real-world examples on display.

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Methods used in this brief

• Project-Based Learning
• Inquiry Circle
• Think-Pair-Share
• Gallery Walk