We learned from the water cycle that we are using and re-using the same water that has been on earth since the beginning of time. The scary part is that while the water is the same, the amount of clean water has gone down. At some point, if we do not take care of it, we will be left with only contaminated water. The water cycle is important because it ensure the availability of water for all living things. 95% of our world is water but most of it is either frozen or underground and also purifies water ready for re-use.