Mining Basics
Describe overburden
Overburden is the soil and rock layer above a mineral deposit.
Explain the chemical process behind acid mine drainage
When sulfide minerals (like pyrite) are exposed to oxygen and water, they form sulfuric acid, which lowers pH and leaches toxic metals into water.
Define clear-cutting
Clear-cutting is removing all trees in an area
Explain why urban areas experience higher temperatures than rural areas
Urban materials (asphalt, concrete) absorb and retain heat, lack vegetation reduces cooling, and waste heat from energy use increases temperatures.
Define ecological footprint and identify what it measures.
It measures the amount of land and water needed to support a person’s resource use and waste absorption.
Compare surface mining and subsurface mining in terms of cost and environmental impact
Surface mining is cheaper and more efficient but causes greater environmental damage
Subsurface mining is more expensive and dangerous but less disruptive to surface ecosystems.
Identify the primary environmental and human health risks associated with gold mining
Mercury and cyanide contamination, which poison water supplies and bioaccumulate in organisms.
Explain how selective cutting can maintain forest ecosystem stability compared to clear-cutting
It removes only specific trees, preserving biodiversity, soil structure, and nutrient cycling.
Distinguish between urbanization and urban sprawl, including environmental consequences
Urbanization is population growth in cities
Urban sprawl is uncontrolled expansion, leading to habitat loss, increased car use, and pollution.
Identify one major activity that increases carbon footprint and explain why
Burning fossil fuels (e.g., driving) releases CO₂, increasing greenhouse gas concentrations.
Explain how strip mining alters landscapes and affects long-term land usability
It removes large land strips, leaving spoil piles and degraded soil, making land difficult to restore for agriculture or ecosystems.
Define tailings and explain their environmental risks
Tailings are leftover waste after ore extraction. They can contain toxic metals and contaminate soil and water.
Explain how clear-cutting impacts soil fertility and water retention
Removes roots that hold soil, increases erosion, reduces organic matter, and decreases water infiltration.
Describe four causes of urban flooding
Impervious surfaces, poor drainage systems, removal of vegetation, and increased stormwater runoff.
Describe the Tragedy of the Commons in groundwater use
Individuals overuse shared aquifers for personal benefit, leading to depletion and long-term scarcity.
Evaluate one advantage and one disadvantage of mountaintop removal mining.
Advantage: efficient coal extraction
Disadvantage: ecosystem destruction and water contamination.
Justify why mining in Arctic/Antarctic regions is environmentally harmful
Fragile ecosystems recover slowly, biodiversity is low but specialized, and disturbances can cause long-term irreversible damage.
Explain how deforestation contributes to climate change through the carbon cycle
Trees store carbon, removing them releases CO₂ and reduces carbon sequestration, increasing atmospheric carbon.
Explain how urban runoff degrades aquatic ecosystems
Carries pollutants (oil, heavy metals, nutrients) into waterways, causing eutrophication and harming organisms.
Propose one realistic strategy to reduce ecological footprint and explain its impact
Using public transportation reduces fossil fuel use and lowers carbon emissions.
Explain the full process and environmental consequences of mountaintop removal mining, including downstream effects
Blasting removes mountaintops to access coal. Debris fills valleys, burying streams, increasing flooding, and contaminating water systems.
Compare the economic benefits of mining with its ecological costs, providing one example of each.
Economic: job creation and resource supply
Ecological: habitat destruction and pollution (e.g., acid drainage).
Evaluate how deforestation affects biodiversity and gene flow in fragmented habitats
Habitat fragmentation isolates populations, reduces gene flow, increases inbreeding, and lowers biodiversity.
Propose two engineering or planning solutions to reduce urban runoff and explain how they work
Permeable pavement allows water infiltration
Green roofs absorb rainwater, reducing runoff volume
Explain how stabilizing human population growth can reduce global carbon emissions
Fewer people reduce total resource consumption and energy demand, lowering overall greenhouse gas emissions.