An explanation of each stage of the water cycle. When the Sun shines, water evaporates and rises. As the water vapour reaches a certain altitude, it condenses to form clouds and precipitation occurs.

Learn about the water cycle with these interactive learning resources for KS2 Science students aged 7-11 from BBC Bitesize.

Billions of years ago, Mars used to have water on its surface. But over time, this water was lost. Now scientists have created a computer simulation which shows how water vapor moves through the ...