AP-ENVSC
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AP® Environmental Science
AP Environmental Science introduces foundational concepts of ecosystems, biodiversity, population dynamics, earth systems, and land‑water resource management, emphasizing key terminology, pollutant types, energy sources, and pivotal legislation.
160
Minutes
83
Questions
3/5
Passing Score
$98
Exam Cost
Who Should Take This
High‑school juniors and seniors, early‑college students, or adult learners preparing for AP exams who seek a rigorous introduction to environmental science should consider this certification. They typically have basic biology knowledge, aim to master ecological terminology and policy, and plan to pursue college‑level environmental studies or related careers.
What's Covered
1
All nine units of the AP Environmental Science course framework (College Board, effective 2020-present): Unit 1 The Living World: Ecosystems
2
, Unit 2 The Living World: Biodiversity
3
, Unit 3 Populations
4
, Unit 4 Earth Systems and Resources
5
, Unit 5 Land and Water Use
6
, Unit 6 Energy Resources and Consumption
7
, Unit 7 Atmospheric Pollution
8
, Unit 8 Aquatic and Terrestrial Pollution
9
, Unit 9 Global Change
What's Included in AccelaStudy® AI
Adaptive Knowledge Graph
Practice Questions
Lesson Modules
Console Simulator Labs
Exam Tips & Strategy
20 Activity Formats
Course Outline
60 learning goals
1
Unit 1: The Living World — Ecosystems
2 topics
Energy Flow in Ecosystems
- Identify the trophic levels in an ecosystem (producers, primary consumers, secondary consumers, tertiary consumers, decomposers) and construct food chains and food webs showing energy transfer relationships.
- Explain the ten percent rule for energy transfer between trophic levels and use ecological pyramids (energy, biomass, numbers) to represent the decreasing energy available at higher trophic levels.
- Distinguish between gross primary productivity and net primary productivity, calculate NPP from GPP and respiration data, and explain why NPP varies across biomes.
Biogeochemical Cycles
- Describe the major reservoirs and fluxes in the water cycle, carbon cycle, nitrogen cycle, and phosphorus cycle, identifying the biological, chemical, and geological processes that drive each cycle.
- Explain the processes of nitrogen fixation, nitrification, denitrification, and ammonification, describing the roles of bacteria in converting nitrogen between its various chemical forms.
- Analyze how human activities (fossil fuel combustion, deforestation, fertilizer use, mining) disrupt biogeochemical cycles and predict the environmental consequences of these disruptions.
2
Unit 2: The Living World — Biodiversity
2 topics
Biodiversity and Ecosystem Interactions
- Define species diversity, genetic diversity, and ecosystem diversity, and explain why each level of biodiversity is important for ecosystem resilience and function.
- Describe ecological relationships including mutualism, commensalism, parasitism, predation, and competition, explaining how these interactions influence population dynamics and community structure.
- Apply the theory of island biogeography to predict species richness based on island size and distance from the mainland, and extend the model to habitat fragments on continents.
Ecological Tolerance and Succession
- Explain the concept of ecological tolerance ranges and describe how abiotic factors (temperature, moisture, pH, salinity) determine the distribution and abundance of species.
- Describe primary and secondary ecological succession, identifying pioneer species, intermediate communities, and climax communities, and explaining the abiotic and biotic factors that drive each stage.
- Compare r-selected and K-selected reproductive strategies, predicting which strategy is advantageous in different environmental conditions and stages of succession.
3
Unit 3: Populations
2 topics
Population Ecology
- Define population density, growth rate, birth rate, death rate, immigration, and emigration, and use these parameters to calculate population change over time.
- Compare exponential and logistic population growth models, explaining the role of carrying capacity and density-dependent factors in limiting population growth.
- Distinguish between density-dependent limiting factors (competition, predation, disease) and density-independent limiting factors (natural disasters, climate events) and analyze their effects on population size.
Human Population Dynamics
- Describe the four stages of the demographic transition model and explain how industrialization, education, and access to healthcare drive the transition from high birth/death rates to low birth/death rates.
- Interpret age structure diagrams to predict future population growth trends and determine whether a population is growing rapidly, growing slowly, stable, or declining.
- Calculate the rule of 70 to estimate population doubling time and apply it to analyze the global implications of current human population growth rates.
- Evaluate the environmental impact of human population growth including resource depletion, habitat destruction, and increased waste generation, synthesizing data from multiple sources.
4
Unit 4: Earth Systems and Resources
2 topics
Geology and Soil Science
- Describe the theory of plate tectonics including the types of plate boundaries (convergent, divergent, transform) and explain how tectonic processes create earthquakes, volcanic eruptions, and mountain formation.
- Describe the composition of soil including mineral particles, organic matter, water, and air, and explain the soil formation process and the characteristics of the major soil horizons (O, A, B, C, R).
- Analyze the causes and consequences of soil erosion and evaluate soil conservation practices including terracing, contour plowing, windbreaks, cover crops, and no-till agriculture.
Atmosphere and Climate
- Identify the layers of the atmosphere (troposphere, stratosphere, mesosphere, thermosphere) and describe the properties and environmental significance of each layer.
- Explain the global patterns of atmospheric circulation (Hadley, Ferrel, polar cells, Coriolis effect, ITCZ) and how they influence global weather patterns and biome distribution.
- Describe the El Nino-Southern Oscillation (ENSO) cycle and explain how El Nino and La Nina events affect regional weather patterns, ocean temperatures, and marine ecosystems worldwide.
- Analyze how latitude, altitude, ocean currents, and proximity to large water bodies interact to determine regional climate patterns and the distribution of major terrestrial biomes.
5
Unit 5: Land and Water Use
2 topics
Agriculture and Land Management
- Describe the environmental impacts of modern industrial agriculture including monoculture, pesticide use, fertilizer runoff, soil degradation, and water consumption from irrigation.
- Compare the environmental benefits and tradeoffs of sustainable agriculture practices including organic farming, integrated pest management, crop rotation, polyculture, and genetically modified organisms.
- Explain the environmental impacts of deforestation, overgrazing, and urban sprawl on ecosystems, and evaluate land management strategies for forests, rangelands, and urban areas.
Water Resources and Mining
- Describe the distribution of freshwater resources on Earth, explain the role of aquifers and watersheds, and identify the causes and consequences of groundwater depletion and aquifer contamination.
- Compare irrigation methods (flood, furrow, drip, center pivot) in terms of water efficiency, energy use, and environmental impacts including salinization and waterlogging.
- Describe the environmental impacts of surface mining and subsurface mining and evaluate remediation strategies for restoring mined landscapes.
- Design a sustainable water management plan for a given region by integrating conservation strategies, water treatment technologies, and policy considerations to balance human needs with ecosystem health.
6
Unit 6: Energy Resources and Consumption
2 topics
Nonrenewable Energy Sources
- Describe the formation, extraction, and environmental impacts of fossil fuels (coal, oil, natural gas) including air pollution, water pollution, habitat destruction, and greenhouse gas emissions.
- Explain how nuclear fission reactors generate electricity, describe the advantages and disadvantages of nuclear power, and discuss the challenges of radioactive waste disposal and accident risks.
- Analyze the global distribution and projected depletion timeline of fossil fuel reserves and evaluate the geopolitical and economic implications of dependence on nonrenewable energy sources.
Renewable Energy Sources
- Describe the principles, advantages, and limitations of solar energy (photovoltaic, concentrated solar), wind energy, hydroelectric power, geothermal energy, and biomass energy.
- Compare the environmental impacts, energy efficiency, and economic feasibility of renewable and nonrenewable energy sources, evaluating their potential to meet growing global energy demand.
- Explain the concept of energy efficiency and conservation, calculate energy efficiency ratios, and evaluate strategies for reducing energy consumption in buildings, transportation, and industry.
- Design an energy plan for a community that balances energy needs, environmental impacts, and economic constraints by integrating multiple renewable and nonrenewable sources.
7
Unit 7: Atmospheric Pollution
2 topics
Air Pollutants and Smog
- Identify the six criteria air pollutants regulated by the Clean Air Act (CO, Pb, NO2, O3, PM, SO2) and classify air pollutants as primary or secondary based on their formation mechanism.
- Explain the formation of photochemical smog from vehicle emissions and industrial smog from coal combustion, describing the chemical reactions, conditions, and health effects of each type.
- Describe the formation and environmental effects of acid deposition (acid rain) including impacts on aquatic ecosystems, forests, soils, and buildings, and identify the sources of sulfur dioxide and nitrogen oxide emissions.
Indoor Air Pollution and Remediation
- Identify common indoor air pollutants (radon, asbestos, carbon monoxide, formaldehyde, volatile organic compounds, mold) and describe their sources, health effects, and remediation strategies.
- Evaluate strategies for reducing air pollution including catalytic converters, scrubbers, electrostatic precipitators, cap-and-trade systems, and clean energy transitions, assessing effectiveness and tradeoffs.
8
Unit 8: Aquatic and Terrestrial Pollution
2 topics
Water Pollution
- Distinguish between point source and nonpoint source water pollution, identify common water pollutants (pathogens, nutrients, sediment, thermal, chemical), and describe their effects on aquatic ecosystems.
- Explain the process of cultural eutrophication caused by excess nutrient runoff, describing the sequence of algal bloom, oxygen depletion, dead zone formation, and ecosystem degradation.
- Describe the stages of municipal sewage treatment (primary, secondary, tertiary) and explain how each stage reduces different types of contaminants from wastewater.
Solid and Hazardous Waste
- Compare solid waste disposal methods including sanitary landfills, incineration, recycling, composting, and source reduction, evaluating the environmental and economic tradeoffs of each approach.
- Explain the processes of bioaccumulation and biomagnification of persistent organic pollutants and heavy metals through food chains, describing the health effects on organisms at higher trophic levels.
- Describe the major categories of hazardous waste (corrosive, ignitable, reactive, toxic) and evaluate remediation approaches for contaminated sites including bioremediation and phytoremediation.
9
Unit 9: Global Change
3 topics
Ozone Depletion and Climate Change
- Explain the natural greenhouse effect and describe how anthropogenic emissions of carbon dioxide, methane, nitrous oxide, and fluorinated gases enhance the greenhouse effect and contribute to global warming.
- Describe the evidence for global climate change including temperature records, ice core data, sea level rise, glacier retreat, and changes in species distribution, and evaluate the scientific consensus.
- Explain how chlorofluorocarbons (CFCs) deplete stratospheric ozone, describe the health and environmental consequences of ozone depletion, and evaluate the effectiveness of the Montreal Protocol.
- Explain the process of ocean acidification caused by dissolved CO2, describe its impacts on marine organisms (particularly calcifying organisms), and connect it to increasing atmospheric carbon dioxide concentrations.
Biodiversity Loss and Conservation
- Identify the primary threats to biodiversity (habitat destruction, invasive species, overexploitation, pollution, climate change) and explain how each contributes to species decline and extinction.
- Explain the ecological and economic consequences of invasive species, describing mechanisms of introduction and the characteristics that make certain species successful invaders.
- Evaluate conservation strategies including protected areas, habitat corridors, captive breeding programs, and international agreements (CITES, ESA), assessing their effectiveness and limitations.
Integrated Environmental Solutions
- Evaluate climate change mitigation strategies (carbon taxes, cap-and-trade, renewable energy transition, carbon capture, reforestation) and adaptation strategies (sea walls, drought-resistant crops, managed retreat), comparing their feasibility and effectiveness.
- Construct a comprehensive environmental management plan that integrates scientific evidence, economic analysis, and social equity considerations to address a complex environmental problem such as climate change or biodiversity loss.
Scope
Included Topics
- All nine units of the AP Environmental Science course framework (College Board, effective 2020-present): Unit 1 The Living World: Ecosystems (6-8%), Unit 2 The Living World: Biodiversity (6-8%), Unit 3 Populations (10-15%), Unit 4 Earth Systems and Resources (10-15%), Unit 5 Land and Water Use (10-15%), Unit 6 Energy Resources and Consumption (10-15%), Unit 7 Atmospheric Pollution (7-10%), Unit 8 Aquatic and Terrestrial Pollution (7-10%), Unit 9 Global Change (15-20%).
- Ecosystems: ecosystem structure, energy flow (food chains, food webs, trophic levels), ecological pyramids (energy, biomass, numbers), primary productivity (GPP and NPP), biogeochemical cycles (carbon, nitrogen, phosphorus, water, sulfur), and ecosystem services.
- Biodiversity: species diversity, genetic diversity, ecosystem diversity, island biogeography theory, ecological tolerance, natural disruptions, and adaptive strategies (K-selected and r-selected species).
- Populations: population ecology concepts (density, distribution, growth models), carrying capacity, exponential versus logistic growth, survivorship curves, demographic transition model, age structure diagrams, and human population dynamics.
- Earth systems and resources: plate tectonics, soil composition and formation, soil erosion and conservation, the atmosphere (layers, composition), weather and climate systems, El Nino/La Nina, and Earth's geological resources.
- Land and water use: agriculture (Green Revolution, GMOs, organic farming, irrigation methods), forestry, rangelands, urban land development, mining, fishing, freshwater resources, aquifers, desalination, and land conservation strategies (national parks, wildlife refuges, habitat corridors).
- Energy resources: fossil fuels (coal, oil, natural gas), nuclear energy (fission, fusion), renewable energy sources (solar, wind, hydroelectric, geothermal, biomass, hydrogen fuel cells, tidal), energy conservation, and energy efficiency.
- Atmospheric pollution: primary and secondary air pollutants, photochemical smog, industrial smog, acid deposition (acid rain), the Clean Air Act, indoor air pollution (radon, asbestos, formaldehyde, CO), particulate matter, noise pollution, and strategies for reducing air pollution.
- Aquatic and terrestrial pollution: point and nonpoint source pollution, water treatment, sewage treatment, eutrophication, thermal pollution, solid waste disposal (landfills, incineration, recycling, composting), hazardous waste, biomagnification, bioaccumulation, persistent organic pollutants (POPs), and endocrine disruptors.
- Global change: stratospheric ozone depletion (CFCs, Montreal Protocol), global climate change (greenhouse effect, evidence, impacts, mitigation, adaptation), ocean acidification, invasive species, endangered species, habitat fragmentation, and international environmental policy (Kyoto Protocol, Paris Agreement, CITES).
- Exam-aligned skills including quantitative analysis, experimental design, data interpretation, and evidence-based argumentation as tested in AP Environmental Science free-response and multiple-choice questions.
Not Covered
- Advanced organic chemistry and biochemistry beyond the basic understanding of biogeochemical cycling and pollutant behavior.
- Detailed engineering design of pollution control systems and energy generation facilities beyond conceptual understanding.
- Environmental law and policy specifics beyond the major landmark legislation and international agreements mentioned in the AP framework.
- Advanced climatology, atmospheric physics, and oceanography beyond the conceptual treatment in the AP course.
- Detailed taxonomy and systematics of organisms beyond what is needed for ecological understanding.
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