G25: Environmental Geology
The environmental impact of geology and human activities: mining, quarrying, waste disposal, contaminated land and climate change.
Environmental Geology
The environmental impact of geology and human activities: mining, quarrying, waste disposal, contaminated land and climate change.
Key Fact: Quarrying and mining: landscape destruction, dust, noise, water pollution; requires restoration after closure
Key Fact: Contaminated land: former industrial sites with polluted soil and groundwater; requires remediation before redevelopment
Key Fact: Landfill: waste disposal in quarries; liner systems prevent leachate contaminating groundwater; methane is captured or flared
Key Fact: Geothermal energy: heat from Earth's interior used for electricity and heating; clean, renewable but location-dependent
Key Fact: Carbon capture and storage (CCS): injecting CO2 into deep porous rocks to reduce atmospheric emissions
Key Fact: Sustainable resource use: recycling, reducing consumption, finding substitutes for scarce minerals
📋 Key Vocabulary and Concepts
For Environmental Geology, you must know:
- Leachate: Contaminated liquid formed when water percolates through waste material, dissolving pollutants
- Remediation: The process of cleaning up contaminated land to make it safe for reuse
- Geothermal energy: Energy extracted from Earth's internal heat, typically using hot water or steam from deep aquifers
- Carbon capture and storage: Technology that captures CO2 from emissions and stores it permanently in deep geological formations
- Restoration: Returning a quarry or mine site to beneficial use after operations cease (e.g. nature reserve, lake)
❓ Practice Questions
Q: What are the environmental impacts of quarrying?
Q: How does landfill contaminate groundwater?
Q: What is geothermal energy and where does it work best?
Q: How can carbon capture and storage help reduce climate change?
Q: Why is remediation of contaminated land important?
✅ Answers
- Landscape destruction and habitat loss, dust and noise pollution, vibration from blasting, visual intrusion, increased traffic, changes to drainage and groundwater flow, and loss of agricultural land.
- Rainwater percolating through waste dissolves harmful chemicals, forming leachate. If the landfill liner fails or is absent, leachate enters the underlying aquifer, polluting groundwater used for drinking.
- Energy from Earth's internal heat, accessed by drilling into hot aquifers or using heat pumps. It works best in tectonically active areas (e.g. Iceland) where high temperatures occur at shallow depth.
- CO2 from power stations and industry is captured, compressed and injected into deep porous rocks where impermeable cap rocks trap it permanently, preventing it entering the atmosphere.
- Contaminated land poses risks to human health, groundwater quality and ecosystems. Remediation allows safe redevelopment, regenerating brownfield sites and reducing pressure on greenfield land.
🎯 Exam Tips
- Quarrying impacts: landscape, dust, noise, water, traffic
- Landfill: leachate must be contained by liners and collection systems
- Geothermal = clean energy from Earth heat; CCS = storing CO2 underground
- Balance both benefits and drawbacks of geological resource exploitation
📝 Exam Technique
GCSE Geology Exam Tips — Environmental Geology:
1. For Environmental Geology questions, use correct geological terminology and classify features precisely
2. Reference specific geological time periods and processes
3. When interpreting data, consider the quality and limitations of the evidence
4. Apply your understanding of Environmental Geology to fieldwork observations and map data
5. For evaluation, weigh competing geological theories with evidence
1. For Environmental Geology questions, use correct geological terminology and classify features precisely
2. Reference specific geological time periods and processes
3. When interpreting data, consider the quality and limitations of the evidence
4. Apply your understanding of Environmental Geology to fieldwork observations and map data
5. For evaluation, weigh competing geological theories with evidence
⚠️ Common Errors
✗ Quarrying has only negative impacts ✓ Quarrying provides essential construction materials; modern quarries must restore sites afterwards, often creating valuable habitats or amenities
✗ Landfill is the only waste disposal method ✓ Modern waste management prioritises reduction, reuse and recycling before landfill; energy-from-waste is an alternative
✗ Carbon capture and storage is already widely used ✓ CCS technology exists but is deployed at only a small number of sites worldwide; scaling it up remains a major challenge
✍️ Model Answer
Full-Mark Response
Discuss the environmental impacts of extracting geological resources and describe how they can be managed sustainably. [6 marks]
Extracting geological resources has significant environmental impacts. Quarrying destroys landscapes, generates dust, noise and vibration, increases traffic and disrupts groundwater. Mining produces acid mine drainage (sulfide minerals oxidising to sulfuric acid) polluting rivers, and tailings dams risking failure. Fossil fuel extraction causes habitat destruction and oil spills. However, these impacts can be managed. Modern quarries must submit restoration plans; after closure, sites become nature reserves, lakes or development land. Landfill sites require engineered liners and leachate collection to protect groundwater; methane is captured for energy. Contaminated land is remediated before redevelopment. Sustainability requires a hierarchy: reduce consumption first, then reuse and recycle. Geothermal energy and carbon capture and storage (injecting CO2 into deep geological formations) offer ways to reduce climate impact. The circular economy concept minimises waste and keeps resources in use, reducing the need for new extraction while recognising that geological resources remain essential for modern life.
📊 AO Deep Dive
Assessment Objective Analysis
AO1 (Knowledge & Understanding): Demonstrate knowledge and understanding of environmental geology, including key geological concepts, observational data and theoretical models relevant to OCR J357.
AO2 (Application of Knowledge): Apply knowledge and understanding of environmental geology to both familiar and unfamiliar geological contexts, using field evidence and theoretical principles to explain phenomena.
AO3 (Analysis & Evaluation): Analyse geological data related to environmental geology, evaluate evidence from observations and investigations, and construct reasoned arguments using scientific methodology.
📝 Exam Questions by Topic
🎬 Video Resources
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