Lesson 1 - How much water is in the world?

Activity: Map the World's Water

What is the approximate mileage of each square on the map?

Each square on the map is approximately 200 miles across.

How many Post-It strips will I need?

You’ll need at least 86 half-inch Post-It strips for the graph:

• 76 for saltwater
• 9 for frozen water
• 1 for freshwater

We also recommend having a few extras on hand, just in case!