Shared by everyone

Three homes fill buckets from one street tank. Each bucket leaves less water in the tank. Drag each slider. See when the tank runs short.

One tank gives water to a whole street.

Shared resource — one amount that many people use. What one home takes is not left for the others.

Air is shared too. There is no wall around the air on a street.

Water goes round and round in nature. So it is used again and again.