Biology and Geology.Teoría,
actividades y prácticas de laboratorio. 1º ESO Programa SELE • María
del Mar Vera Sánchez
Contents and activities
UNIT 5. The hydrosphere
5.2. THE WATER CYCLE
The energy from the Sun is the motor that powers the water cycle.
Evaporation and evapotranspiration.
Liquid water from oceans, rivers or lakes (evaporation) or from living things (evapotranspiration) changes to water vapor (gas).
Condensation.
Water vapor (gas) changes to liquid water forming clouds, dew and fog.
Precipitation.
Liquid water in the clouds falls to the ground as rain (also liquid), snow (solid water) or hail (solid water).
Surface run-off.
Surface water forms rivers and streams when it moves across the land.
Infiltration.
Water filters into the ground and flows underground through soil and rocks.