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