You have reached the end of the task and every one should now have their power point presentation ready to and also ready to present it in your classroom for authorities to view.
You should know now how important water is to us all. 70% of the earth is covered with water, but only 1% is easily accessible to us. Water is such a scarce resource and with more and more news of areas fighting with water shortages and droughts, saving water and using it more efficiently has become an absolute necessity.
That's all the time we have for this topic, but if you'd like to pursue it more on your own check these resources out.