Study Notes
Earth's water distribution is predominantly salt water, with only a small percentage being fresh water, most of which is not readily accessible. Water security involves ensuring reliable access to clean water for various uses while maintaining ecosystems.
- Salt Water — Water with high salt content, primarily found in oceans and seas. Example: The Pacific Ocean contains about 50% of the world's ocean water.
- Fresh Water — Water with low concentrations of dissolved salts, essential for human use. Example: Lakes and rivers are major sources of accessible fresh water.
- Groundwater — Water stored in underground aquifers, making up about 30% of global freshwater. Example: Accessed through wells and boreholes.
- Water Security — Reliable access to sufficient quantities of acceptable quality water. Example: Essential for health, livelihoods, and production.
- Climate Variability — Changes in climate patterns affecting water availability. Example: Unpredictable rainfall leading to droughts or floods.
Exam Tips
Key Definitions to Remember
- Salt Water
- Fresh Water
- Groundwater
- Water Security
Common Confusions
- Confusing salt water with fresh water availability
- Misunderstanding the accessibility of groundwater
Typical Exam Questions
- What is water security? Reliable access to sufficient quantities of acceptable quality water.
- How does climate variability affect water security? It alters precipitation patterns, leading to droughts or floods.
- What percentage of Earth's water is fresh? Only 2.5% of Earth's water is fresh.
What Examiners Usually Test
- Understanding of global water distribution
- Causes and impacts of water insecurity
- Strategies for improving water supply and management