The Water CycleThe Water Cycle

Section 1-3 Section 1-3

Pages 32-35Pages 32-35

https://www.youtube.com/watch?v=IY_Lu6e0HNo

I wonder…I wonder…

Is it possible that a Is it possible that a drop of water that drop of water that landed on your landed on your sidewalk yesterday is sidewalk yesterday is the same drop that fell the same drop that fell on a stegosaurus long on a stegosaurus long ago? ago?

Water CycleWater Cycle

The The water cyclewater cycle is the continuous is the continuous process by which water moves process by which water moves through the through the livingliving and and nonlivingnonliving parts parts of the environment.of the environment.

Water is naturally Water is naturally recycledrecycled through through the water cycle. the water cycle.

Water moves Water moves continuouslycontinuously; there is ; there is no real beginning or end. no real beginning or end.

Water CycleWater Cycle

In the water cycle, In the water cycle, water moves from water moves from bodies of water, bodies of water, landland, and living , and living things on Earth’s things on Earth’s surface to the surface to the atmosphereatmosphere and and back to Earth’s back to Earth’s surface. surface.

Water CycleWater Cycle What is the driving force behind the What is the driving force behind the

water cycle? water cycle? The The sunsun is the source of energy that is the source of energy that

drives the water cycle. drives the water cycle.

EvaporationEvaporation Large amounts of water Large amounts of water

evaporate constantly evaporate constantly from the from the surfacessurfaces of of oceans and large lakes oceans and large lakes (salt gets left behind). (salt gets left behind).

Small amounts Small amounts evaporate from evaporate from soilsoil, , puddles, and your puddles, and your skinskin. .

A significant amount A significant amount of water is given off of water is given off by by plantsplants. Plants . Plants draw in water from draw in water from the soil through their the soil through their rootsroots. Eventually the . Eventually the water is given off water is given off through the through the leavesleaves as water vapor. This as water vapor. This is called is called transpirationtranspiration. .

Clouds FormClouds Form

Once a water molecule Once a water molecule finds its way into the finds its way into the atmosphere (as water atmosphere (as water vapor), it eventually vapor), it eventually condensescondenses into liquid into liquid water forming clouds. water forming clouds.

Blame it on the RainBlame it on the Rain

What goes up must What goes up must eventually come eventually come down. down.

Water that falls to Water that falls to Earth as rain, snow, Earth as rain, snow, hail, or sleet is called hail, or sleet is called precipitationprecipitation. .

What happens to What happens to precipitation? precipitation?

Most falls directly into the Most falls directly into the oceanocean Some falls on land and then it might…Some falls on land and then it might…

run offrun off the land into rivers and lakes the land into rivers and lakes seep into the seep into the groundground

AnimalsAnimals may drink it, then release as a may drink it, then release as a waste product.waste product.

PlantsPlants use water to grow and produce use water to grow and produce food. food.

A Global ProcessA Global Process

For millions of years, the For millions of years, the total amount of water on total amount of water on Earth has remained Earth has remained fairly fairly constantconstant. .

The worldwide amounts The worldwide amounts of evaporation and of evaporation and precipitation precipitation balancebalance each other. each other.

Words Worth Knowing (ISN Words Worth Knowing (ISN #39)#39)

Transpiration Transpiration PrecipitationPrecipitation