Science · 6th Grade · Human Impact and Engineering · Weeks 28-36

Impact of Resource Extraction

Students investigate the environmental consequences of mining, drilling, and logging.

• Common Core State Standards
• MS-ESS3-1

About This Topic

Engineering Solutions for Natural Hazards focuses on how humans can use technology and design to protect themselves from Earth's most powerful forces. Students learn about the science behind hazards like earthquakes, floods, and hurricanes, and then apply the engineering design process to mitigate their effects. This topic aligns with MS-ESS3-2 and MS-ETS1-2.

Students explore how different materials and structures respond to stress. They investigate the trade-offs involved in engineering, such as cost, aesthetics, and environmental impact. This unit helps students to see themselves as problem-solvers who can use science to make communities safer and more resilient.

Students grasp this concept faster through structured discussion and peer explanation, especially when they can build and test their own 'disaster-proof' structures on shake tables or in wind tunnels.

Key Questions

1. Explain how the extraction of minerals impacts local groundwater.
2. Analyze the long-term ecological effects of deforestation.
3. Critique current practices in resource extraction and propose improvements.

Learning Objectives

• Explain how the removal of trees affects soil stability and water runoff in a given region.
• Analyze the impact of oil drilling on local water sources and ecosystems, citing specific examples.
• Evaluate the environmental consequences of mining operations on landforms and biodiversity.
• Propose modifications to current resource extraction methods to minimize ecological damage.

Before You Start

Ecosystems and Food Webs

Why: Students need to understand how living organisms depend on their environment and each other to analyze the effects of habitat destruction.

Water Cycle and Its Importance

Why: Understanding how water moves through the environment is crucial for analyzing the impact of extraction on groundwater and surface water.

Earth's Resources

Why: Students should have a basic understanding of what minerals, fossil fuels, and timber are to investigate their extraction.

Key Vocabulary

deforestation	The clearing or removal of forests or stands of trees from land, which is then converted to non-forest use, such as for agriculture or urban development.
groundwater	Water held underground in the soil and rock layers, often accessed through wells for drinking water and irrigation.
sedimentation	The process where solid particles, like soil or rock fragments, settle out of water or air and accumulate as sediment, often increasing in rivers due to erosion from logging or mining.
habitat fragmentation	The process by which a large, continuous habitat is broken into smaller, isolated patches, often caused by logging or infrastructure development.
reclamation	The process of restoring land that has been mined or otherwise disturbed to a natural or economically usable state.

Watch Out for These Misconceptions

Common Misconception

Students often think that 'stronger' always means 'stiffer' when it comes to buildings.

What to Teach Instead

Explain that in an earthquake, a building that is too stiff will snap. Many earthquake-proof buildings are designed to be flexible or to 'sway' with the movement. Using flexible vs. rigid models on a shake table can demonstrate this clearly.

Common Misconception

Many believe that we can 'stop' natural hazards from happening.

What to Teach Instead

Clarify that we cannot stop an earthquake or a hurricane, but we can *mitigate* (lessen) the damage through smart engineering and preparation. Peer discussion about the difference between 'prevention' and 'mitigation' is key.

Active Learning Ideas

Simulation Game: Shake Table Challenge

Students build towers out of toothpicks and marshmallows. They test them on a 'shake table' (a tray on tennis balls) to see which designs survive a simulated earthquake and then discuss why certain shapes were stronger.

50 min·Small Groups

Inquiry Circle: Flood Defense

Using a tray of soil, students must design a 'levee' or 'dam' using limited materials (clay, rocks, popsicle sticks). They test their design by pouring a 'flood' of water and measuring how much 'land' was protected.

45 min·Small Groups

Think-Pair-Share: The Cost of Safety

The teacher presents a high-tech solution (like a massive sea wall) and a low-tech solution (like planting mangroves). Students discuss with a partner the pros and cons of each, focusing on cost and environmental impact.

20 min·Pairs

Real-World Connections

• In regions like Appalachia, coal mining has historically led to significant groundwater contamination and land subsidence, impacting local communities and ecosystems. Environmental engineers work on projects to remediate these sites.
• The Amazon rainforest faces ongoing deforestation due to cattle ranching and logging. This loss of trees contributes to soil erosion and alters rainfall patterns, affecting global climate and local biodiversity.
• Oil extraction in the Arctic National Wildlife Refuge raises concerns about potential spills impacting sensitive tundra environments and the migration patterns of caribou, a vital resource for indigenous populations.

Assessment Ideas

Discussion Prompt

Pose the question: 'Imagine a town needs lumber for new homes. What are two ways loggers can harvest trees while minimizing soil erosion and impact on animal habitats?' Facilitate a class discussion, guiding students to consider selective logging or buffer zones.

Quick Check

Provide students with a short case study about a fictional town experiencing water pollution after nearby mining operations began. Ask them to identify: 1. The likely source of pollution. 2. One way the mining company could have prevented this. 3. One step the town could take to address the problem.

Exit Ticket

Ask students to write on an index card: 'Name one resource extraction method and describe one specific environmental problem it can cause. Then, suggest one way to reduce that problem.'

Frequently Asked Questions

What is the engineering design process?

It is a series of steps that engineers follow to solve a problem: Define the problem, Brainstorm solutions, Build a prototype, Test and evaluate, and then Redesign to make it better.

How do engineers make buildings earthquake-proof?

They use techniques like 'base isolation' (putting the building on pads that act like shock absorbers) and 'cross-bracing' (using diagonal beams to create strong triangles in the frame).

How can active learning help students understand natural hazard engineering?

Active learning, like the 'Shake Table Challenge,' allows students to fail safely. When their tower falls, they have to analyze *why* it failed and how to fix it, which is the heart of engineering. This hands-on testing makes the physics of structural integrity much more intuitive than reading about it in a textbook. It also encourages collaboration and creative problem-solving.

What is a 'levee'?

A levee is a natural or artificial wall (usually made of earth) built along the banks of a river to prevent it from overflowing its banks and flooding the surrounding land.