Ch. 7 Lesson 3What is the water cycle?

water vaporwater vapor

gas in form of water

invisible gas

air pressureair pressure• pressure of gas particles against another object

• pushes in all directions

air pressure decreases as you move higher in atmosphere

water cycle• repeated movement of water thru.

environment in different forms

• affected by temp, pressure, wind & elevation

water cycle

precipitation

storage

condensation

evaporation

evaporation liquid water

water vapor

Evaporation video clip

condensation water vapor liquid water (water droplets in clouds or dew)

Condensation video clip

precipitation water falls from clouds- rain, snow, sleet or hail

sublimation ice water vapor w/out melting

runoff water moving downhill

frost water vapor ice crystals w/out forming liquid water

Magic School Bus Water Cycle video clip

Water Cycle online activity

Water Cycle Song

dew

water vapor liquid water(forms from condensation)

condensation water vapor liquid water

runoffwater moving downhill

precipitation (rain)water falls from clouds

sublimation ice water vapor w/out melting

frostwater vapor ice crystals w/out forming liquid water

evaporationliquid water water vapor