The water you use every day is billions of years old.
All water on Earth is constantly recycled, and has been on Earth since before life began.
It has fallen as rain, washed into rivers, frozen as glaciers...
... And passed through animals from dinosaurs to ourselves... constantly recycled in what we call the water cycle.
The Water Cycle
The largest natural reservoirs of water are in the oceans.
When sunlight warms the surface, the heat energy changes liquid water to gas.
This process is called evaporation.
The water vapor rises into the atmosphere, then cools and condenses to form clouds.
As water droplets combine, heavy raindrops form and are released as precipitation.
Although precipitation is intercepted by natural and man-made structures... most eventually forms surface runoff, feeding rivers and lakes.
Some groundwater finds its way back into the atmosphere though plants and trees.
Water is sucked in through the roots and released through the leaves into the atmosphere as vapour.
This process is called transpiration.
Eventually this water vapor will condense and form clouds - falling back to earth as rain.
Rain can also find its way underground through porous rock.
Ground water can be found hundreds of meters below the surface, forming underground reservoirs.
Water is also stored in glaciers, which lock in water as ice for thousands of years.
This water, along with rivers... and lakes... will eventually end up back at its source... the ocean.
From here, the cycle starts all over again.
A cycle which the water on our planet has completed around 8 million times.