Understanding Earth's Water Supply

Through a classroom demonstration, students will calculate the percentage of fresh water available for human use and explain why water is a limited resource. Students will choose appropriate units of measurement for  volume.
With guidance, students will pose questions to clarify practical problems or inform a scientific investigation, and predict what the findings of an investigation might be. Students connect volume and capacity and their units of measurement. Students will be able to physically represent percentages using 100 pieces of paper and articulate how smaller volumes of water represent the Earth’s total water content.