Why is water valuable?

Water surrounds us everywhere: every day we take a shower, drink mineral water or tea;
many enjoy walks along the embankments and swimming in the pool. But there are places on Earth where water sources are few or nonexistent. Why are they so unevenly distributed? Why do fish breathe in water, while humans cannot? How did the sea become salty? How does water get into our tap? And can snowdrifts and ice also be called water? The book answers countless children's questions, expands horizons, introduces natural laws, and provides space for reflection and action. Interesting tasks will help understand the water cycle in nature, teach how to desalinate salty water, and clearly explain which water is easier to float on. A careful approach to water resources is important to master from childhood, as humans directly influence the World Ocean, and the quality of water greatly affects the future of our entire planet.