1. 1 UNIT 1: WATER SYSTEMS ON EARTH (c) McGraw Hill Ryerson 2007 Chapter 1 Section 1.1: Distribution of Water Slide Show #1

2. 2 (c) McGraw Hill Ryerson 2007 1.1 Distribution of Water Water exists everywhere on Earth, and covers 70% of its surface. 97% of this water is found in the oceans.  Another 2% is ice and snow, leaving only 1% as fresh water found in the ground, rivers, lakes and streams.  Finding fresh water to drink is a challenge in many places, as most fresh water is under the ground. See page 9

3. 3 Question Time...... Considering that less than 1% of the water on Earth must supply billions of organisms, why do you think we have not yet run out of fresh water? (c) McGraw Hill Ryerson 2007

4. The Water Cycle Lithosphere – the solid rocky ground of Earth’s crust. Atmosphere – the environment surrounding the planet. Hydrosphere – all the water on Earth (including the water in the lithosphere and atmosphere). 4

5. 5 (c) McGraw Hill Ryerson 2007 The Water Cycle Earth is the only planet with water in all 3 states Water is continually cycling through the water cycle Heat energy from the Sun or lack there of, causes these changes to drive the water cycle. Solid  Liquid = Melting Liquid  Gas = Evaporation Gas  Liquid = Condensation Liquid  Solid = Solidify/Freeze Solid  Gas = Sublimation Gas  Solid = Deposition

6. 6 (c) McGraw Hill Ryerson 2007 The Water Cycle (continued) The water cycle occurs everywhere, not just oceans  Water evaporates due to the energy supplied by the sun, and then condenses in the atmosphere as clouds when it cools and falls as precipitation. The water then runs-off back to storage basins, or soaks into the ground. See pages 9

7. 7 Quick Fact!!!!! Each Year 520,000 km 3 of the water from the Earths Surface evaporates to form water vapour. That’s enough to fill over 208,000 Olympic-size swimming pools! (c) McGraw Hill Ryerson 2007

8. 8 Assignment #1A (Section 1.1) Check Your Understanding (p.13) #5, #7, and #8 (c) McGraw Hill Ryerson 2007