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Earth’s Water - A Drop in the Bucket

Science 8 - Fresh and Salt Water Systems

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How do we use water?

Take 2 minutes in your table groups to brainstorm a list of ways we use water on a daily basis.

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How else might water be used in other ways?

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Where do we get water?

Brainstorm natural sources of water:

- Oceans

- Groundwater

- Lakes

- Ice/Glaciers

- Wetlands

- Rivers/Streams

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All the water in the world

1L represents all of the world’s water - but how much can we drink?

Oceans - 970 mL - 97%

Fresh Water - 30 mL - 3%

* Frozen - 21 mL - 2.1%

* Groundwater - 9 mL - 0.9%

* Surface (rivers, lakes, wetlands) - 0.5 mL

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Daily Water Consumption

Here are a few statistics:

- Toilets use about 15-20 L per flush

- Faucets use about 12 L per minute

- Laundry uses about 230 L per load

- Showerheads use about 25 L per minute

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Take a moment to consider how much water you consume in a day.

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How much water do we use as a class in one day?

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How can we save water?

Brainstorm some ideas about how you individually can reduce how much water consumption.

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If each of us committed to reduce our water consumption by just 5 L per day what would happen?