Water cycle, also called hydrologic cycle, cycle that involves the continuous circulation of water in the Earth-atmosphere system. The condensation droplets are the clouds. Although the total amount of water within the cycle remains essentially constant, its distribution among the various processes is … When the plastic bag is hung in a sunny window, heat from the Sun evaporates water from the lake and forms condensation and precipitation. This activity has been developed in partnership with the Waikato Regional Council as part of the Rivers and Us resource. How does the water cycle model work? Models are often used when it is difficult to see or experience the real thing. In science, a model is a representation of an idea, an object, a process or a system. The bags are placed in a sunny location and enable students to model how the Sun’s energy and the force of gravity drive aspects of the water cycle. By the end of this activity, students should be able to: Modelling the water cycle Using a plastic bag, students can model the water cycle. draw some of the features of the water cycle, discuss the role of the Sun in the water cycle, discuss the role of gravity in the water cycle, make predictions about what might happen with their model. In this activity, students draw a representation of the water cycle onto resealable bags. You should find that you can see condensation drops of water on the top of the cling film and that the water level have lowered proving that evaporation has taken place. Curious Minds is a Government initiative jointly led by the Ministry of Business, Innovation and Employment, the Ministry of Education and the Office of the Prime Minister’s Chief Science Advisor. explain how their model is similar/different to the actual water cycle. Although we live in the middle of the water cycle, it is difficult for students to see aspects of it in action because they either happen underground or involve invisible processes (transpiration and evaporation) and gravity – a non-contact force. Of the many processes involved in the water cycle, the most important are evaporation, transpiration, condensation, precipitation, and runoff. By the end of this activity, students should be able to: Another way to visualise underground components of the water cycle is by constructing an aquifer model. They will be dripping back into the bowl but you should find that some of the water is now in the cup (your mountains) demonstrating …

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