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THE HYDROSPHERE
Water on Earth
Earth: water in three states
Distribution of water on Earth
Salt water
Fresh water
Glaciers
Groundwater
Surface water
Properties of water
Changes of water
Other properties of water
The importance of water for Living things
Life under ice
The universal solvent
Thermal regulator
Hugh adhesive capacity
THE WATER CYCLE
Graphic of the water cycle
The water cycle and the atmosphere
The water cycle and the geosphere
The water cycle and the biosphere
Uses of water
Water pollution
Clean water and health
Drinking water treatment
Wastewater treatment
