Why does water flow from the tap?

Where does the water come from in our homes? From a little cloud to the ground, across the ground – as a river, from the river into a pipe, from the pipe – to the tap. But that's not all! There are also swamps, seas, groundwater, underground lakes, wells and artesian wells, springs, reservoirs, and fountains – what are these and how has man learned to use water, will be explained by the author of this book, Pyotr Mikhailovich Voltsit. For younger school age.