Science · 7th Grade · Earth's Changing Surface · Weeks 28-36

Human Impact on Earth Systems

Students research the distribution of resources and the consequences of their extraction.

• Common Core State Standards
• MS-ESS3-1
• MS-ESS3-4

About This Topic

Human activities interact with all four of Earth's major systems: the geosphere, hydrosphere, atmosphere, and biosphere. This topic addresses MS-ESS3-1, which asks students to analyze data about the distribution of natural resources, and MS-ESS3-4, which asks students to construct an argument supported by evidence about the relationship between human activities and changes in Earth systems. The uneven geographic distribution of resources is a direct consequence of plate tectonics, geological history, and climate.

Fossil fuels illustrate this principle clearly. Coal, oil, and natural gas formed under specific geological conditions over millions of years and are concentrated in particular sedimentary basins. Their extraction provides energy but releases carbon stored over geological time in a matter of decades. Mining operations alter landforms and affect waterways. Agricultural practices influence soil carbon content and groundwater levels. Students who understand these connections can evaluate trade-offs more accurately than those who see resources as simply present or absent.

This topic invites genuine analysis and student voice. When students research real resource distribution data, trace supply chains back to their own daily lives, and evaluate the long-term costs of specific extraction practices, the content becomes personally relevant in ways that support both comprehension and broader civic engagement.

Key Questions

1. Why are some natural resources found in only a few places on Earth?
2. What are the long term costs of relying on non-renewable energy?
3. How can we balance human needs with the health of the ecosystem?

Learning Objectives

• Analyze data on the global distribution of at least three key natural resources (e.g., oil, copper, rare earth elements).
• Evaluate the environmental and social impacts associated with the extraction and processing of a chosen non-renewable resource.
• Construct an evidence-based argument explaining how human demand for resources influences geopolitical relationships.
• Compare the long-term economic and ecological costs of relying on fossil fuels versus renewable energy sources.
• Propose specific strategies for balancing human resource needs with ecosystem health in a local or regional context.

Before You Start

Plate Tectonics and Earth's Structure

Why: Understanding how tectonic plates move and interact explains the geological processes that concentrate mineral and fossil fuel resources in specific locations.

Weathering and Erosion

Why: Knowledge of how landforms are shaped is foundational to understanding the physical impacts of mining and resource extraction on the geosphere.

Key Vocabulary

Natural Resource Distribution	The geographic pattern of where specific resources like minerals, fossil fuels, and water are found on Earth, often influenced by geological processes and climate.
Extraction	The process of removing valuable materials from the Earth's crust, such as mining for metals or drilling for oil and gas.
Non-renewable Resource	A natural resource that exists in finite quantities and is consumed much faster than it can be regenerated, such as fossil fuels and certain minerals.
Supply Chain	The sequence of processes involved in the production and distribution of a commodity, from raw material extraction to the final consumer.
Ecosystem Services	The benefits that humans receive from natural ecosystems, such as clean air and water, pollination, and climate regulation, which can be impacted by resource extraction.

Watch Out for These Misconceptions

Common Misconception

Natural resources are distributed more or less equally around the world.

What to Teach Instead

The distribution of mineral, fossil fuel, and water resources is profoundly uneven, shaped by geological history, plate tectonic activity, and climate patterns spanning millions of years. This unevenness drives global trade patterns, geopolitical relationships, and economic inequality. Mapping actual resource distribution data makes this empirical reality visible to students who may have assumed rough global uniformity.

Common Misconception

Once a natural resource is used, it is completely gone from Earth.

What to Teach Instead

Matter is not destroyed but changes form and location. Burned fossil fuels release CO2 into the atmosphere rather than disappearing. Mined metals can often be recycled back into manufacturing. The key distinction is between processes that keep material usable (metal recycling) and those that make recovery extremely difficult (combustion). The concept of renewable versus non-renewable is about regeneration rate, not absolute disappearance.

Active Learning Ideas

Inquiry Circle: Resource Distribution Maps

Groups receive maps and data tables showing the global distribution of four resources: petroleum, rare earth elements, fresh water, and arable land. They identify which regions have abundant or scarce quantities of each, then overlay population and economic development data to find regions where resource distribution does not match population need. Groups write a claim about what distribution patterns reveal regarding global resource equity.

50 min·Small Groups

Think-Pair-Share: Tracing Your Technology

Students individually trace one device they own to its raw material sources: lithium for batteries, coltan for capacitors, aluminum for casings. They share where each material is mined and how it reaches the manufacturing facility. Partners discuss what this supply chain reveals about resource geography and the environmental footprint embedded in everyday consumer electronics.

25 min·Pairs

Stations Rotation: Costs of Extraction

Four stations examine different extraction practices with real data: mountaintop removal coal mining in Appalachia, oil sands extraction in Alberta, rare earth mining in inner Mongolia, and lithium brine extraction in the Atacama Desert. At each station, students identify specific environmental and community impacts, then compare the types and scales of impact across all four.

45 min·Small Groups

Gallery Walk: Energy Transition Trade-offs

Post information panels on five energy sources (coal, natural gas, solar PV, wind, nuclear) with lifecycle data on CO2 emissions, land use, water use, employment impacts, and cost per kWh. Students annotate each with trade-offs they identify, place a sticky note indicating which system they would recommend expanding and why, then compare their recommendations with classmates who chose differently.

35 min·Whole Class

Real-World Connections

• Geologists and mining engineers work for companies like BHP or Rio Tinto to locate and extract minerals such as iron ore and bauxite, essential for manufacturing steel and aluminum used in construction and vehicles.
• Environmental consultants analyze the impact of oil and gas drilling operations in regions like the Permian Basin, advising on mitigation strategies to protect local water sources and wildlife habitats.
• Urban planners in rapidly growing cities like Shenzhen, China, must consider the sourcing of materials for infrastructure projects and the waste management implications of consumer goods, impacting global resource demand.

Assessment Ideas

Quick Check

Provide students with a world map showing the distribution of a specific resource, like cobalt. Ask them to identify the top three countries where it is found and write one sentence explaining why its limited distribution matters for technology like smartphones.

Discussion Prompt

Pose the question: 'If a new, highly efficient method for extracting a rare earth element is discovered in a protected wilderness area, what are the key factors a community council should consider when deciding whether to allow it?' Facilitate a discussion where students debate the economic benefits versus ecological costs.

Peer Assessment

Students research the supply chain of a common product (e.g., a t-shirt, a laptop). They create a simple flowchart showing resource extraction, manufacturing, and distribution. Partners review each other's flowcharts, checking for at least three distinct stages and identifying one potential environmental impact at each stage.

Frequently Asked Questions

Why are some natural resources found in only a few places on Earth?

Resource distribution reflects geological and climatic history. Petroleum forms from ancient organic material buried and transformed under specific pressure and temperature conditions in particular sedimentary basins. Rare earth elements concentrate in specific igneous and metamorphic geological settings. Fertile soils formed under conditions of high rainfall and biological activity over thousands of years. Each resource type has formation requirements that were met in particular locations.

What are the long-term costs of relying on non-renewable energy?

Non-renewable fuels take millions of years to form and are consumed in decades. As accessible reserves deplete, extraction moves to more difficult and expensive locations. The combustion products accumulate in the atmosphere faster than natural carbon sinks can absorb them, altering the climate system at a rate without geological precedent. There are also supply security costs when energy imports are concentrated in geopolitically unstable regions.

How can we balance human needs with the health of ecosystems?

Balancing human needs and ecosystem health requires understanding the services ecosystems provide: clean water, air, biodiversity support, carbon storage, and pollination. Sustainable resource management sets extraction rates below regeneration rates for renewable resources. For non-renewable resources, the challenge is transitioning to alternatives before depletion while managing the environmental disruption of both current and transition-technology extraction.

How does active learning help students understand human impact on Earth systems?

Human impact on Earth involves interconnected systems and genuine trade-offs that are difficult to reason about from a linear explanation. When students analyze actual resource distribution data, trace specific supply chains, and evaluate extraction case studies with real environmental data, they encounter the genuine complexity these trade-offs involve. MS-ESS3-4 asks students to construct evidence-based arguments about these relationships, which requires engaging with real data rather than simplified summaries.