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# Freshwater - PowerPoint PPT Presentation

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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### Freshwater

3%= Freshwater

97 %= Saltwater

76%=

Ice

23%= Groundwater

1%=

Lakes & Rivers

Can you believe that and Rivers?

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

70%

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?

Gains=evaporation

Loses=Condensation

6. cycle and when are they losing energy in the water cycle?Explain the Water cycle. What powers the water cycle?

Elementary Water Cycle cycle and when are they losing energy in the water cycle?

Middle School Water cycle and when are they losing energy in the water cycle?Cycle

permeable

impermeable

What is it powered by? cycle and when are they losing energy in the water cycle?

SUN

Explain the Water Cycle cycle and when are they losing energy in 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! cycle and when are they losing energy in the water cycle?

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?

CONDENSATION

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 pollution? Give an example of each.

Point-source Water Pollution pollution? Give an example of each.

National Park Service, Indiana Dunes National Lakeshore

9. Describe two water can be conserved pollution? Give an example of each.

• 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. pollution? Give an example of each.

• Don’t litter

• Use organic pesticides