The water we use every day is very old. Just like the Earth itself, it’s been around for billions of years. The Earth has a limited amount of water that always gets recycled. It is in a closed system. Since we do not lose or gain water from other sources, it’s important to protect the water we have.
The water cycle is a natural process that happens when water rotates through different forms (solid, liquid, or vapor). The process improves the quality of water. However, people do things that create water pollution.
Some content courtesy of the National Library of Medicine.