水循环WaterCyclePPT课件.ppt

1、The Water CycleTo understand the processes involved in the water cycleWhat is Evaporation?It is the process of a liquid heating to form a gasWhat is Condensation?It is the process of a gas cooling to form a liquidThe Water CycleWater is constantly moving between sea,air and landThe Water CycleWater

2、is constantly moving between sea,air and landThe sun shines and the sea is heatedheatThe Water CycleWater is constantly moving between sea,air and landEvaporationThe water evaporates and forms cloudsThe Water CycleWater is constantly moving between sea,air and landCondensationAs air rises it cools a

3、nd condenses.It reaches the ground as rain,snow,sleet or hail.The Water CycleWater is constantly moving between sea,air and landThe snow melts and flowsRivers flow to the seaLakes formSnow formsThe Water CycleWater is constantly moving between sea,air and landThe Water Cycle is completeThe Water Cyc

4、leWater is constantly moving between sea,air and landThe Water CycleWater is constantly moving between sea,air and landThe sun shines and the sea is heatedheatThe Water CycleWater is constantly moving between sea,air and landEvaporationThe water evaporates and forms cloudsThe Water CycleWater is con

5、stantly moving between sea,air and landCondensationAs air rises it cools and condenses.It reaches the ground as rain,snow,sleet or hail.The Water CycleWater is constantly moving between sea,air and landThe snow melts and flowsRivers flow to the seaLakes formSnow formsThe Water CycleWater is constant

6、ly moving between sea,air and landThe Water Cycle is completeThe Water CycleWater is constantly moving between sea,air and landQuestions1.Where does the water come from?2.What happens to it when the sun heats it up?3.As the vapour rises what happens to it?4.Where does it go then?5.How does the water get back to the sea?