Category: ESS 4.4 Water Pollution
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![ESS 4.4.5 [AHL] Indicator Species and Biotic Index](https://mypytrclass.com/wp-content/uploads/2025/05/image-4.png?w=1024)
ESS 4.4.5 [AHL] Indicator Species and Biotic Index
Learning Objectives Part 1: Indicator Species ..are organisms whose presence, absence, or abundance reflects a specific environmental condition, such as pollution. They are not limited to water pollution and can indicate: Tolerance to Pollution Some species can tolerate low oxygen levels caused by organic pollution and thrive in polluted conditions. Others cannot survive in low…
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ESS 4.4.3 Eutrophication
Learning Objectives Part 1: Eutrophication Process Anthropogenic Eutrophication Phosphorus Nitrogen Impacts of Eutrophication Consequences Part 2: [AHL] Harmful Algal Blooms (HABs) Freshwater HABs Marine (Coastal) HABs Other Factors Part 3: Eutrophication on Ecological Services Effects on Fishing Effects on Recreation Aesthetic Impacts Health Concerns Part 3: Management Strategies Altering Human Activities Reducing Emission Clean-Up Strategies…
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![ESS 4.4.2 [Case Studies] 16 Top Water Crises Around the World](https://mypytrclass.com/wp-content/uploads/2025/05/the-seine-river-polluted-in-paris.png?w=1024)
ESS 4.4.2 [Case Studies] 16 Top Water Crises Around the World
1. Flint Water Crisis (USA) 2. Ganges River Pollution (India) 3. Citarum River (Indonesia) 4. Lake Tai (China) 5. Niger Delta (Nigeria) 6. Yamuna River (India) 7. Aral Sea Shrinkage (Kazakhstan/Uzbekistan) 8. Wular Lake (India) 9. Tiete River (Brazil) 10. Love Canal (USA) 11. Po River (Italy) 12. River Thames (UK) 13. Oder River (Poland/Germany,…
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ESS 4.4.4 Water Quality Indicators
Learning Objectives Part 1: Water Quality Assessment Water quality monitoring in freshwater systems involves assessing: Purpose of data collection: Standard water quality tests can be conducted on drinking water, rivers, and other sites using portable equipment that detects: Common water quality indicators for rivers include: Two main methods of measuring water quality: Summary of measures:…
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ESS 4.4.2 Introduction to Water Pollution
Learning Objectives Part 1: Defining Water Pollution Freshwater and marine pollution sources: Storm water pollution: Annual highway run-off (1 km of M1 in the UK): Part 2: Point and Non-Point Water Pollutions Point Source Pollution Non-Point Source Pollution Common Types of Water Pollutants: Part 3: Plastics in the Ocean Plastic Pollution in Oceans Case Study:…
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![ESS 4.4.1 [AHL] Aquatic Dead Zones and Water Treatment](https://mypytrclass.com/wp-content/uploads/2025/05/image-1.png?w=1024)
ESS 4.4.1 [AHL] Aquatic Dead Zones and Water Treatment
Learning Objectives Part 1: Hypoxic and Anoxic Causes and Impacts of Hypoxia and Anoxia in Aquatic Systems Part 2: Water Treatment Overview of Sewage Treatment Global Differences in Sewage Treatment – Global treatment rate (2021): ~52% of sewage treated Part 3: Stages of Water Treatment Exercise 1. What is a primary cause of hypoxia in…
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