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What percentage of Earth's surface is covered by water?

• 50%

• 65%

• 71%

• 80%

What is the primary component of saltwater?

• Magnesium Sulfate

• Calcium Carbonate

• Potassium Chloride

• Sodium Chloride

What percentage of Earth's water is fresh water that humans can drink?

• 96.5%

• 68%

• 3.5%

• 2%

Where is the majority of Earth's fresh water trapped?

• Rivers and lakes

• Groundwater

• Ice and glaciers

• Atmosphere

What form does a very small amount of fresh water take in the atmosphere?

• Rain

• Snow

• Water vapor

• Hail