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Apuntes

**THE IMPORTANCE OF WATER ON OUR PLANET** • Subtopic: A Scarce Natural Resource Water is unevenly distributed in nature. Overexploitation by humans continuously depletes water reserves, and pollution affects water quality. To resolve these problems, water needs to be stored efficiently, used responsibly, and reused. • Subtopic: Water Cycle Water is essential for ecosystems and biological processes. The water cycle includes evaporation, where heat causes water to evaporate; condensation, where vapor forms clouds; precipitation, where water falls as rain, snow, or hail; and collection, where the water reaches rivers and the sea. • Subtopic: Distribution of Water **Continental Water** This source is fresh. Continental water consists of surface water and groundwater. **Sea Water** This water is salty. It is found in seas and oceans. --- **WHAT IS RELIEF?** Relief refers to all features of the Earth's crust. • Subtopic: Continental Landforms - **Mountains**: High landforms with steep sides. - **Valleys**: Areas of land between mountains. - **Plains**: Low and flat areas of land. - **Plateaus**: Flat areas of land higher than plains. - **Depressions**: Areas with lower alti...