Keep within a water budget. Learners find out that less than 2.5% of Earth's water is available to drink—and that there is a fixed amount of water. Scholars read an interesting article comparing the available water to a game of Monopoly with a limited amount of funds. They also learn that it's the distribution of the funds that matters. Pupils gain a deeper understanding of the water cycle and create a poster or mural to show its dynamic nature.