How many litres of water can an oak tree release in one year Which type of cloud can be 10000 times heavier than a 747 passenger plane How fast does a raindrop travel Find the answers to these questions and many more as you take a closer look at The Water Cycle - by numbers From the smallest raindrop to the largest ocean water is all around you and all living things need water to survive. Discover how water is recycled again and again through the water cycle - and how the water you drink today may be the same water that a dinosaur drank more than 100 million years ago