Approximately 75% of Earth’s surface is covered with water. The amount of that water that is drinkable by humans is:

Most humans get their water from:

Infiltration:

Many people say that desalination (removing the salt from ocean water) is the obvious way around our water shortages. This is:

If too much water is removed by a well in coastal areas:

One creative way that some communities deal with wastewater is:

Why do the problems of water scarcity and unsanitary water conditions often occur together?

Discuss at least two of the reasons why having enough potable water is a problem for so many people on Earth.

Draw a flow chart of the water cycle. (Don’t copy from the book; do your own small drawing.) Follow a single water molecule from a cloud through some portion of the cycle, including a living organism, and back to a cloud.

Describe, in your own words, the percentage of total water on Earth that is freshwater, and identify the compartments where it is located.

What are some different things that communities can do to deal with their wastewater?