Video Lesson on The Water Cycle

What percentage of the Earth's water is saltwater?

• 97%

• 7%

• 90%

• a small percentage

What percentage of Earth's total water is fresh water?

• 97%

• 50%

• 3%

• 10%

Where is nearly two-thirds of Earth's fresh water stored?

• Oceans and seas

• Rivers and lakes

• Polar ice caps, snowpacks, and glaciers

• Underground aquifers

In how many states does water exist on Earth?

• One

• Two

• Three

• Four

Which substance is identified as the primary greenhouse gas in Earth's atmosphere?

• Carbon dioxide

• Methane

• Water vapor

• Nitrous oxide