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What physical factors determine the supply of water? . G4 Water Key Idea 2.1. Rivers only 2% of surface freshwater. The parts of the water cycle. Global values of the water cycle. Climate determines where rain falls – Highs and Lows. Freshwater availability varies at different scales.
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What physical factors determine the supply of water? G4 Water Key Idea 2.1
Climate Change – ultimately reduced river flows in some areas Global warming will melt most Andean glaciers in the next 30 years, scientists say, threatening the livelihood of millions of people who depend on them for drinking water, farming and power generation.