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Water Systems on Earth

Water Systems on Earth. Chapter 1.1. Water Systems on Earth Distribution of Water. Water can be found just about everywhere on earth (as liquid water, ice or vapour) BUT... 97% of that water is salt water, leaving only 3% as “ fresh water”

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Water Systems on Earth

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  1. Water Systems on Earth Chapter 1.1

  2. Water Systems on EarthDistribution of Water • Water can be found just about everywhere on earth (as liquid water, ice or vapour) • BUT... 97% of that water is salt water, leaving only 3% as “fresh water” • Since most of that is frozen, less than 1% of earth’s water is actually available to us as liquid fresh water

  3. So, why haven’t we run out of fresh water? We need to examine the water cycle, but first keep in mind...

  4. The water cycle is the interaction between three “spheres” of Earth: • Lithosphere – the solid rocky ground of Earth’s crust • Atmosphere – the environment surrounding the planet • Hydrosphere – all of the water on Earth whether it’s in or on the earth or in the atmosphere above

  5. Two changes of state make the water cycle possible: • Evaporation – liquid water on the earth’s surface changes into gaseous water vapour • Condensation –gaseous water vapour from the atmosphere cools to liquid water

  6. Work • Label diagram of water cycle (handout) • Read pg 8-9 • Answer Questions pg 13 # 1, 2, 3, 4, 6, 8

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