On the first page, students create two pie charts: 1) how much of the earth is land vs. water, and 2) how much of Earth's water is fresh vs. salt water. On the second page, they use a NSGS publication (provided as a link, but data table can easily be printed) to complete a table of more specific locations of Earth's water (ocean, ice, groundwater, lakes, swamps, and rivers). Students then create a bar graph to visually represent the amount of Earth's water at each of these. I have students use colored pencil so each is a different color. This is a great way to reinforce graphing and emphasize the importance of data. It also allows students to make their own realizations about the limited liquid fresh water on Earth's surface.