Study Notes
Human influences on the environment include pollution, deforestation, and the greenhouse effect, all of which have significant impacts on ecosystems and climate.
- Pollution — the process by which harmful substances are added to the environment. Example: Chemical waste and untreated sewage polluting water bodies.
- Eutrophication — a process where excess nutrients in water bodies lead to excessive algae growth and oxygen depletion. Example: Fertilizers washing into rivers causing algal blooms.
- Acid Rain — rain that contains dissolved sulfur dioxide and nitrogen oxides, causing environmental harm. Example: Damage to buildings and aquatic life due to acidic precipitation.
- Greenhouse Gases — gases that trap heat in the Earth's atmosphere, contributing to global warming. Example: Carbon dioxide and methane from burning fossil fuels.
- Deforestation — the clearing of forests for land and resources, leading to habitat loss and climate change. Example: Soil erosion and reduced rainfall due to tree removal.
- Sewage Treatment — the process of removing contaminants from wastewater to prevent pollution. Example: Using aerobic bacteria to treat effluent before releasing it into water bodies.
Exam Tips
Key Definitions to Remember
- Pollution
- Eutrophication
- Acid Rain
- Greenhouse Gases
- Deforestation
- Sewage Treatment
Common Confusions
- Confusing the causes of eutrophication with its effects.
- Mixing up greenhouse gases with pollutants that cause acid rain.
Typical Exam Questions
- What is eutrophication? Eutrophication is the process where excess nutrients in water bodies lead to excessive algae growth and oxygen depletion.
- How does deforestation affect the environment? Deforestation leads to habitat loss, soil erosion, and changes in climate.
- What are the effects of acid rain? Acid rain can damage plants, aquatic life, and buildings.
What Examiners Usually Test
- Understanding of how human activities contribute to pollution and climate change.
- Ability to explain processes like eutrophication and sewage treatment.
- Knowledge of the effects of deforestation and acid rain on ecosystems.