1. Unit #5 Fresh and Salt Water Systems

2. Topic #1 A World of Water

3. Topic #1 – A World of Water
Water is the key to life – scientists believe that life cannot exist without it!
More species of organisms inhabit the water than any other place on Earth
Whether you realize it or not, you depend on water every moment of your life

4. Salt water – water such as ocean water and seawater that has a high salt content
97% of the earth’s water is salt water – not drinkable (potable)
Fresh water – water that most organisms can drink or use for life functions such as lake water, river water, pond water or well water.

5. How do you depend on water?
About 65% of your body mass is water
In comparison, an apple is about 84% water and a watermelon is about 98% water
Every breath you exhale has water vapour in it
Every cellular process uses a tiny fraction of your body’s water
To maintain a normal body temperature of 37 degrees Celsius you need to sweat and release water
You lose water every time you eliminate wastes as well
You need to consume about 2.5L of water each day

6. How else do we depend on water?

7. How else do we depend on water?
Swimming and other recreational activities

8. How else do we depend on water?
Swimming and other recreation
Watering lawns/flowers/etc

9. How else do we depend on water?
Swimming and other recreation
Watering lawns/flowers/etc
Putting out fires

10. How else do we depend on water?
Swimming and other recreation
Watering lawns/flowers/etc
Putting out fires
Cooling vehicles/running machinery

11. How else do we depend on water?
Swimming and other recreation
Watering lawns/flowers/etc
Putting out fires
Cooling vehicles/running machinery
Hydro-electric power

12. The Water Cycle
Ever wondered when it rains, “Where does all that water go?”
Some runs off the land into streams and rivers and then flows into oceans
Some soaks, seeps and flows underground
Some goes into wetlands and lakes
Some just appears to vanish into the atmosphere

13. The ability of water to appear and disappear is the result of 2 previously learned changes of state: evaporation and condensation
The water cycle controls the distribution of Earth’s water as it evaporates from bodies of water, condenses, precipitates and returns to those bodies of water
The Sun’s energy drives the water cycle
About 520,000km2 of water is evaporated each year on Earth

14. Water vapour does not remain in the atmosphere for very long
On average there is only enough water vapour in the atmosphere for a 10 day supply of
precipitation
worldwide
About 78% of
this precipitation
falls into the
oceans

15. Distribution of Water on Earth
Take the WATER QUIZ
1) How much of the Earth’s water is salt water?
a) 50% b) 75%
c) 93% d) 97%

16. 2) How much of Earth’s remaining 3% fresh water is frozen in glaciers and ice sheets?
a) 0.50% b) 1%
c) 2.15% d) 2.85%
3) How much does this leave humans for liquid fresh water?
a) 2% b) 1%
c) 0.5% d) 0.1%

17. Distribution of Water on Earth
Only 2.8% of Earth’s water is fresh water
Of this 2.8%, 2.15% is frozen in glaciers and ice sheets
Of the remaining 0.65%, 0.63% is groundwater
This leaves on 0.02% of Earth’s water in rivers, ponds, lakes, etc!!!!!!!!!!!!

20. Concerns??? Water quantity – the amount of water
Water quality – the characteristics of a water resource that make it suitable or unsuitable for various uses
Canada’s
rivers and
lakes we need
to manage
properly

21. Your task…. Complete investigation 5-A on page 365
a) identify and record all the ways your family uses water
b) Talk to your parents and locate the water metre in your house if possible
c) Over the course of one week, estimate how much water your family uses every day
d) Record this data in a table as shown in the Investigation
e) Complete all parts to this activity (questions, tables, etc)
f) graph the results in some form (ie.pie graph)