3 rd Year

 Introduction to water  Discuss the importance of water  Understand the Water Cycle and how it works  Key words and definitions

 Water is the common name applied to the liquid form (state) of the hydrogen and oxygen compound H2O. Pure water is an odorless, tasteless, clear liquid.  Water is one of nature's most important gifts to mankind. Essential to life, a person's survival depends on drinking water.  Water is one of the most essential elements to good health -- it is necessary for the digestion and absorbtion of food; helps maintain proper muscle tone; supplies oxygen and nutrients to the cells; rids the body of wastes; and serves as a natural air conditioning system.  Health officials emphasize the importance of drinking at least eight glasses of clean water each and every day to maintain good health.

 Although water covers more than 70% of the Earth, only 1% of the Earth's water is available as a source of drinking.  Water makes up 50 to 90 percent of the weight of living things.  In your copy list 15 things that you do every day that involves water:  Why does your body need water????

 The hydrologic cycle begins with the evaporation of water from the surface of the ocean.  As moist air is lifted, it cools and water vapor condenses to form clouds.  Moisture is transported around the globe until it returns to the surface as precipitation.  Once the water reaches the ground, one of two processes may occur; 1) some of the water may evaporate back into the atmosphere or 2) the water may penetrate the surface and become groundwater.  Groundwater either seeps its way to into the oceans, rivers, and streams, or is released back into the atmosphere through transpiration.  The balance of water that remains on the earth's surface is runoff, which empties into lakes, rivers and streams and is carried back to the oceans, where the cycle begins again.  Hydrological Cycle Animation Hydrological Cycle Animation

Thirstin's Water Cycle

 Renewable –  Can be used over and over again (non-finite)  Evaporation-  The sun’s heat turns the water into a gas (water vapour) that rises  Condensation-  The water vapour rises, cools and condenses into cloud  Precipitation-  Further cooling causes the clouds to precipitate – rain, hail, sleet, snow, frost, fog, dew.  Transpiration-  Loss of moisture from the leaves of trees and plants  Surface run-off & Underground run-off-  Rivers and soakage return most of the water to the sea.

 Introduction to water  Discuss the importance of water  Understand the Water Cycle and how it works  Key words and definitions  Homework|:  Geography Book pg 277 Q a, b, c  Geography Book pg 279 Bottom picture Q a, b  Geography Book pg 280 Photograph B Q a, b