Water World
Water World represents a water purification system. Find out how to purify a bucket of water so it is clean enough to drink. Try to spill as little as possible, because water is a scarce resource. When you’ve finished the purification process you can water a plant, do the washing up or give a dog a drink.
As far as we know, earth is the only planet in our solar system with liquid water. Water is a precondition for life. In total, around 1.4 billion cubic kilometres of water (1 cubic kilometre = 1,000 billion litres) can be found on earth. This is a huge amount but only 3% of it is fresh water. Of this fresh water, less than a quarter is available to us as drinking water. So we have to be aware of how we use it; and, as a result of environmental pollution, useable water is becoming increasingly scarce.
