Listen to Water Cycle Notes!


1. Sun-our star and the source of all energy on the Earth

2. Solar energy is the energy of the sun.

3. Radiation-how the Sun’s energy moves through space, as radiation strikes the Earth’s surface it changes into heat.

4. hydrologic or water cycle-endless process in which water evaporates from oceans and lakes, condenses into clouds and returns to the Earth as precipitation.

5. Solar energy heats the water and drives the water cycle

6. Three states of water-solid, liquid, and gas

7. 3 major steps of hydrologic cycle-evaporation, condensation, and precipitation

8. evaporation-water changing into a gas called water vapor.  Water vapor is INVISIBLE!!! 

9. transpiration- plants losing water vapor to the air through leaves (plant sweat! )

10. condensation- water vapor cooling down enough to change into tiny droplets of water. 

11. clouds are caused by condensation.  Clouds are NOT water vapor!

12. Atmosphere-has four layers, troposphere, stratosphere, mesosphere, & thermosphere

13. Clouds are formed in the bottom layer of the atmosphere, the troposphere. 

14. clouds form when water vapor condenses on dust, smoke or even salt particles from the ocean.

15. Dew is water droplets that have condensed on the ground in the cool morning air. 

16.  dew point-the temperature at which air becomes saturated with water vapor and condensation begins.

17.  condensation occurs at the dew point.

18. amount of water vapor in air affects dew point.

19. water must condense on something solid.  Dew forms on grass.

20. precipitation-liquid and solid forms of water falling from the sky to the ground.

21. Precipitation forms when water droplets about the size of a period in a sentence start growing, must get about 100 times larger to fall.

22. 4 forms of precipitation- rain, sleet, snow, and hail.

23. Infiltration-a portion of the precipitation that reaches the Earth's surface seeps into the ground, adding to the aquifer.

24. runoff-water from precipitation making its way back into the ocean.

25. Accumulation-places where water is stored when not moving through the water cycle, can be oceans, lakes, rivers, and aquifers.