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Freshwater PowerPoint PPT Presentation

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Freshwater. Study G uide A nswers. 1. What percentage of the Earth is Freshwater? Saltwater ?. 3%= Freshwater 97 %= Saltwater . 2. What percentage of freshwater is Ice? Groundwater? Lake and Rivers?. 76%= Ice 23%= Groundwater 1%= Lakes & Rivers. Can you believe that

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Study Guide Answers

1. What percentage of the Earth is Freshwater? Saltwater?

3%= Freshwater

97 %= Saltwater

2. What percentage of freshwater is Ice? Groundwater? Lake and Rivers?



23%= Groundwater


Lakes & Rivers

Can you believe that

76% of freshwater is in the form of ice?!?!?!

Watch out for those big icebergs!!!

3. What percentage of the Earth is covered by water?


4. Define Precipitation, condensation, evaporation, and transpiration.

  • Condensation – from gas to liquid. Loses energy. Forms clouds

  • Precipitation – falls back to Earth (hail, sleet, rain, snow

  • Evaporation – from liquid to gas (vapor). Gains energy

5. When are water molecules gaining energy in the water cycle and when are they losing energy in the water cycle?



6. Explain the Water cycle. What powers the water cycle?

Elementary Water Cycle

Middle School Water Cycle



What is it powered by?

The water cycle is powered by the:


Explain the Water Cycle

  • Water moves from bodies of water, land and living things to the atmosphere and back to the Earth’s surface

  • Main steps: evaporation-condensation-evaporation

  • The amount of water on Earth is staying about the same

  • Without water, there wouldn’t be living things…including us!

Plants are important too!

Transpiration is the process in which plants release water into the air!

7. During which process of the water cycle does cloud formation take place?


Water vapor cools onto solid surfaces such as dust particles

8. What is the difference between point and non-point pollution? Give an example of each.

  • Point source pollution – pollution is coming from a specific and identifiable place or pipe. Ex: Waste from a factory

  • Nonpoint source pollution – problem is from a wide area and cannot be traced back to one place. Ex: fertilizer runoff from a farm

Nonpoint-source Pollution

Point-source Water Pollution

National Park Service, Indiana Dunes National Lakeshore

9. Describe two water can be conserved

  • Turn off water while brushing teeth

  • Water plants at night

  • Take shorter showers.

  • “If it’s yellow keep it mellow, if it’s brown flush it down”

  • Run washing machine or dishwasher only when it’s full

10. Describe two ways to prevent water pollution.

  • Don’t litter

  • Use organic pesticides

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