To keep on living, all living things need _____
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  • Crash Course videos
  • YouTube videos of cats
  • some form of water
  • Marvel superhero movies
How much of the surface of the Earth is covered in water?
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  • less than half
  • about half
  • about two-thirds
  • more than two-thirds
We actually have enough water on Earth to leave a faucet running for _____
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  • 136 thousand years
  • 136 million years
  • 136 billion years
  • 136 trillion years
Most of the water on earth is _____
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  • in flowing rivers
  • in large lakes
  • trapped in glaciers
  • in the oceans
What kind of water is found in rivers, ponds, wetlands, and streams?
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  • salt water
  • fresh water
  • hard water
  • mineral water
Freshwater contains _____
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  • less than 0.1% salt
  • about 0.1% salt
  • about 1% salt
  • more than 1% salt
Which field of science deals with the Earth's surface?
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  • biology
  • astronomy
  • geography
  • archaeology
On a map of the Earth, most of the blue stuff represents _____
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  • glaciers
  • land
  • fresh water
  • salt water
What percent of the water on the planet is salty?
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  • less than 95%
  • about 95%
  • about 97%
  • more than 97%
What percent of the planet's total water supply is freshwater?
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  • less than 3%
  • about 3%
  • about 5%
  • more than 5%
What percent of the planet's water is locked up freshwater in frozen glaciers or underground?
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  • less than 2%
  • about 2%
  • about 3%
  • more than 3%
In North America, a large source of freshwater  is _____
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  • the Atlantic Ocean
  • the Pacific Ocean
  • the Great Lakes
  • Hudson Bay
What percent of Earth's available freshwater is in the  five Great Lakes?
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  • less than 20%
  • about 20%
  • about 30%
  • more than 30%
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