Science · 6th Grade

Active learning ideas

Natural Hazards: Floods and Landslides

Active learning works for this topic because students need to see how rainfall, soil, and slope interact to create hazards. Hands-on models and real-world case studies make abstract processes visible and memorable.

• Common Core State Standards
• MS-ESS3-2

• 20–45 min
• Pairs → Whole Class
• 4 activities

Activity 01

• Inquiry Circle
• 40 min · Small Groups

Model Building: Slope Saturation and Landslide Triggers

Students construct small hillside models using soil, sand, and gravel in plastic trays tilted at different angles. They add measured amounts of water with spray bottles and record the point at which material begins to slide. Groups compare results across soil types and vegetation (simulated with sponge pieces) to identify which factors most affect slope stability.

Explain the conditions that lead to flash floods.

Facilitation Tip

During Model Building: Slope Saturation and Landslide Triggers, have students test different soil types by adding water slowly to observe how saturation changes slope stability.

What to look for

Provide students with a simplified topographic map showing a river, a steep slope, and a small town. Ask them to circle two areas most likely to flood and two areas most likely to experience a landslide, then write one sentence justifying each choice.

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

Activity 02

• Think-Pair-Share
• 20 min · Pairs

Think-Pair-Share: Reading a Floodplain Map

Each student examines a FEMA floodplain map of a real U.S. community and identifies three areas most likely to flood. They pair up to compare predictions and reasoning, then share with the class. The teacher highlights how elevation, proximity to waterways, and impervious surface coverage all factor into flood risk.

Analyze the role of vegetation in preventing landslides.

Facilitation Tip

For Think-Pair-Share: Reading a Floodplain Map, provide magnifying glasses so students can examine contour lines and elevation changes carefully.

What to look for

Pose the question: 'How can planting trees on a steep hillside help prevent a landslide?' Guide students to discuss soil binding, water absorption, and slope stability, encouraging them to use key vocabulary terms.

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

Activity 03

• Inquiry Circle
• 45 min · Small Groups

Engineering Design Challenge: Flood Mitigation for a Model Town

Small groups receive a flat-tray "town" with buildings, roads, and a river channel. Using materials like clay levees, gravel retention basins, and sponge wetlands, they design a mitigation system and test it against a controlled water pour. Groups present their designs and compare how much water each system diverted or absorbed.

Predict the areas most susceptible to flooding in a given landscape.

Facilitation Tip

While students work on the Engineering Design Challenge: Flood Mitigation for a Model Town, circulate with a checklist to note which teams consider both structural and natural solutions.

What to look for

On an index card, have students define 'impervious surface' in their own words and then list one way building more roads and parking lots can increase flood risk in a neighborhood.

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

Activity 04

• Gallery Walk
• 30 min · Pairs

Gallery Walk: Case Studies of Real Flood and Landslide Events

The teacher posts six station cards around the room, each describing a real event (e.g., 2013 Colorado floods, Oso landslide, Hurricane Harvey flooding). Students rotate in pairs, recording the causes, human factors, and mitigation strategies at each station. A whole-class debrief identifies common patterns across events.

Explain the conditions that lead to flash floods.

Facilitation Tip

During the Gallery Walk: Case Studies of Real Flood and Landslide Events, place a timer near each case study so students practice concise, focused discussions.

What to look for

Provide students with a simplified topographic map showing a river, a steep slope, and a small town. Ask them to circle two areas most likely to flood and two areas most likely to experience a landslide, then write one sentence justifying each choice.

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

A few notes on teaching this unit

Start with the Model Building activity to anchor understanding in concrete experience. Use student observations to introduce key vocabulary and processes before moving to maps or engineering. Avoid rushing through case studies; let students grapple with complexity to build critical thinking. Research shows that when students connect visual models to real data, their retention of cause-and-effect relationships improves significantly.

Students will explain how water moves through landscapes, identify where hazards occur, and evaluate solutions to reduce risk. They will use evidence from models and maps to support their reasoning.

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Watch Out for These Misconceptions

• During Model Building: Slope Saturation and Landslide Triggers, watch for students who assume landslides only happen on very steep slopes.

  Have students test a gentle slope with high water input to show how saturation, not just steepness, triggers failure. Ask them to compare their results to the steeper slope to identify the real trigger: soil saturation and loss of cohesion.

• During Think-Pair-Share: Reading a Floodplain Map, watch for students who think floodplains are always flat areas next to rivers.

  Point students to areas on the map where floodplains appear on steeper terrain near small tributaries or urban drainage ditches. Ask them to trace runoff pathways to see how water collects even without a large river nearby.

• During the Gallery Walk: Case Studies of Real Flood and Landslide Events, watch for students who believe planting trees alone can prevent all landslides.

  Ask students to compare case studies where reforestation worked with those where it failed. Have them list additional factors like slope angle, rainfall intensity, and drainage systems to highlight that multiple strategies are needed.

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Methods used in this brief

• Inquiry Circle
• Think-Pair-Share
• Gallery Walk