Hydrosphere is the total amount of water on a planet: 97% of it is contained in the seas and oceans, which extend over about 3/4 of the earth's surface. The water on Earth is in constant movement and change: through the water cycle, blue gold takes on different aspects: solid, liquid and gaseous. Water is one of the most important resources for life on Earth: without water, there would be no life on our planet. But when did it form, where is it and how did it arrive on our planet? Find out by exploring eniscuola's resources.
