1 4. IDENTYFYING SOLUTIONS TO SOLVE THE WATER PROBLEMS. 4.1 Managing water resources Are we still drinking water that dinosaurs drank? Water evaporates from the oceans, forms clouds, falls as rain (or snow), and returns in rivers to the ocean. The places it...
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1 4. IDENTYFYING SOLUTIONS TO SOLVE THE WATER PROBLEMS. 4.1 Managing water resources Are we still drinking water that dinosaurs drank? Water evaporates from the oceans, forms clouds, falls as rain (or snow), and returns in rivers to the ocean. The places it stays longest are in the deep ocean and in deep ground water, locked in for up to 10000 years. However, water is also destroyed chemically in photosynthesis (plants convert carbon dioxide and water to sugars and oxygen) and recovered again in respiration (basically the reverse of photosynthesis to make energy and CO2). We can calculate how much water remains from the dinosaur age from the total amount of water on the planet and the amount of water taken up in photosynthesis per year. Based on this, we can say that it would take about 100 million years to destroy chemically most of the water. Dinosaurs lived 65 million years ago. So, some of the water we drink is the same water, but more than half is different water. Access to good q
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