What is the most important thing to pack for a hike on a hot summer day?

• a compass
• a map
• hiking boots
• water

What is the chemical formula for water?

• H₂O
• CH₄
• NH₃
• CO₂

On our planet, freshwater is found _____

• in relatively small amounts
• in moderate amounts
• in relatively large amounts
• almost everywhere

Freshwater is water that doesn't contain a lot of _____

• minerals
• pollution
• salt
• oxygen

What percent of the water on the planet is salty?

• less than 1 percent
• about 3 percent
• about 97 percent
• about 99 percent

What percent of the planet's total water supply is freshwater?

• less than 1 percent
• about 3 percent
• about 97 percent
• about 99 percent

What percent of the planet's water is actually fresh water that's accessible to us?

• less than 1 percent
• about 3 percent
• about 97 percent
• about 99 percent

What is one of the most important sources of freshwater in the southwestern U.S.?

• the Mississippi River
• the Missouri River 
• the Colorado River
• the Saint Lawrence River

The Colorado river provides water to more than _____

• 4 thousand people
• 40 thousand people
• 4 million people
• 40 million people

Today, in the Colorado River, how much water is there compared to 100 years ago?

• about 4 million liters more
• about 4 million liters less
• about 4 billion liters less
• about 4 trillion liters less