Saturday, January 14, 2012

Transpiration

one final process is important in the water cycle.As plants absorb water from the soil, the water moves from the roots through the stems to the leaves .once the water reaches the leaves,some of it evaporates from the leaves,adding to the amount of water vapor in the air.And  this process  of evaporation through plant leaves is called transpiration.In large forests an enormous amount of water will transpire through leaves.

Surface Runoff

Much of the water that returns to earth as precipitation runs off surface of the land and flows down hill intoo streams,rivers,ponds and lakes.Further, small streams flow into larger streams ,then into rivers and eventually the water flows into the ocean.

Friday, January 13, 2012

Infiltration

Infiltration is an important process where rain water soaks into the ground ,through the soil and underlying rock layers.some of this water ultimately returns to the surface at springs or in low spots downhill some of the water remains underground and is called groundwater.

precipitation

 
when the temperature and atmospheric pressure are right,the small droplets of water in clouds form larger droplets and precipitation occurs.The raindrops fall to earth.As a result of evaporation , condensation and precipitation,water travels from the surface of the earth goes into the atmosphere and returns to earth.Further, much of the water that returns to earth as precipitation runs off surface of the land and flows down hill into streams,rivers, ponds and lakes.And small streams flow into larger streams then into rivers and eventually the water flows into the ocean.This process is called precipitation.

Thursday, January 12, 2012

Evaporation:- Evaporation is the process where a liquid,in this case water,changes from its liquid state to a gaseous state.Liquid water becomes water vapor.Aithough lower air pressure  helps promote evaporation.During the water cycle some of the water in the oceans and freshwater bodies,such as lakes nad rivers, is warmed by the sun and evaporates on temperature is the primary factor.
Condensation:-
Condensation is the opposite of evaporation.Condensation occurs when a gas is changed into a liquid. Condensation occurs when the temperature of the vapor decreases.