Presentation on theme: "Bell Work: Where does the water cycle get its energy from?"— Presentation transcript:
1 Bell Work: Where does the water cycle get its energy from?
2 What is the water cycle?The water cycle describes the existence and movement of water on, in, and above the Earth.Water is always in motionWater is always changing statesLiquidSolidgas
3 Hydrologic CycleThe water cycle can also be called the Hydrologic Cycle…WHY?Since the water cycle is truly a "cycle," there is no beginning or end.Water can change states among liquid, vapor, and ice at various places in the water cycleThese processes have been happening over millions of years.The water in the apple you ate yesterday may have fallen as rain half-way around the world last year or could have been used 100 million years ago by Mama Dinosaur to give her baby a bath.
4 Components of the Water Cycle Water storage in oceansEvaporationSublimationWater in the atmosphereCondensationPrecipitationWater storage in ice and snowSnowmelt runoff to streamsSurface runoffStream flowFreshwater storageInfiltrationGround-water storageGround-water dischargeSprings
5 Water storage 96.5% of the water on earth is in the oceans 3.5% of the water on earth is fresh90% of the evaporated water contained in the water cycle came from the oceanIce caps and glaciers
7 EvaporationEvaporation is when the sun heats up water in rivers or lakes or the ocean and turns it into vapor or steam. The water vapor, or steam, leaves the river, lake or ocean and goes into the air.90% comes from oceans, seas, lakes and rivers10% comes from plants: transpirationHumidityEvaporation removes heat from the environment: HOW??Once evaporated, a water molecule spend about 10 days in the air.
10 SublimationSublimation: The change of snow or ice to water vapor without meltingSolid gasHigh amounts of energy is needed….Where would this energy come from???South side of Mt. Everest:Low temperaturesStrong windsIntense sunlightLow air pressure
11 TranspirationTranspiration is the process by which plants lose water out of their leaves. Transpiration gives evaporation a bit of a hand in getting the water vapor back up into the airMoisture is carried through plants from roots to small pores on the underside of the leaves, where it changes to vapor and is released to the atmosphere.A large oak tree can transpire 40,000 gallons of water a year.Factors that effect Transpiration:TemperatureRelative humidityWind and air movementSoil-moisture availabilityTypes of plants
13 Water in the atmosphere The atmosphere always contains waterTiny water particles are too small to see UNLESS….CloudsSuperhighway used to move water around the globe
14 CondensationCondensation: Water vapor in the air gets cold and changes back into liquid, forming clouds. Responsible for the formation of CLOUDSVapor liquidCondensation is the opposite of evaporationFogMoisture on your windows or drinkWater vapor in the warm air, turns back into liquid when it touches the cold glass
17 PrecipitationPrecipitation: Occurs when so much water has condensed that the air cannot hold it anymore. The clouds get heavy and water falls back to the earth in the form of rain, hail, sleet or snowMillions of cloud droplets are required to make a single raindrop
19 Surface RunoffSurface Runoff: Occurs as precipitation travels over the soil surface to the nearest stream channel.Run over the soil and collect in the oceans, lakes or rivers where the cycle startsGround saturationFlash floodDeposition can happen during this time….What was that??Dangerous time for pollution to occur