water vapour process
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Heat the water. Then it will be water vapour or steam.
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The earth has a limited *amount of water. That water keeps going around and around and around and around. That's the reason why we call it "Water Cycle".
The cycle consists of different parts. Let's see them:
evaporation ( transpiration + evapotranspiration)condensationprecipitation (rain, snow, hail, sleet)collection (infiltration, surface runoff, percolation)But, before learning about each stage, see this power point presentation. Click here.
Have you got a clear idea of the water cycle? Now, we are going to explain it step by step. The water cycle has no beginning and no ending, but we are going to start with "Evaporation"
EVAPORATION
Evaporation is when the sun heats up water in rivers or lakes or the ocean and turns it into vapor or steam. The water vapor or steam leaves the river, lake or ocean and goes into the air. Look at the photo.
Does water evaporate only from rivers, lakes and oceans? No, people sweat (perspire and plants transpire, that is, plants lose water out of their leaves). This process is called transpiration. The combination of *evaporation and *transpiration is called evapotranspiration. Look at the photo.
CONDENSATION
The process in which water vapour changes into a water droplet or ice crystal is called *condensation. This happens because water vapor in the air gets cold and changes back into liquid, forming clouds. See the photo.
PRECIPITATION
Precipitation occurs when so much water has condensed that the air cannot hold it anymore. The clouds get heavy and water falls back to the earth in the form of rain, hail, sleet or snow
Different types of *precipitation
COLLECTION
When water falls back to earth as precipitation, it may fall back in the oceans, lakes or rivers or it may end up on land. When it ends up on land, it will either soak into the earth and become part of the “ground water” that plants and animals use to drink or it may run over the soil and collect in the oceans, lakes or rivers where the cycle starts all over again.
- *Surface run-off: the excess of rainflows over the land
- *Infiltration/Percolation (groundwater flow or groundwater recharge): processwhere water moves downward from surface water to groundwater.
The cycle consists of different parts. Let's see them:
evaporation ( transpiration + evapotranspiration)condensationprecipitation (rain, snow, hail, sleet)collection (infiltration, surface runoff, percolation)But, before learning about each stage, see this power point presentation. Click here.
Have you got a clear idea of the water cycle? Now, we are going to explain it step by step. The water cycle has no beginning and no ending, but we are going to start with "Evaporation"
EVAPORATION
Evaporation is when the sun heats up water in rivers or lakes or the ocean and turns it into vapor or steam. The water vapor or steam leaves the river, lake or ocean and goes into the air. Look at the photo.
Does water evaporate only from rivers, lakes and oceans? No, people sweat (perspire and plants transpire, that is, plants lose water out of their leaves). This process is called transpiration. The combination of *evaporation and *transpiration is called evapotranspiration. Look at the photo.
CONDENSATION
The process in which water vapour changes into a water droplet or ice crystal is called *condensation. This happens because water vapor in the air gets cold and changes back into liquid, forming clouds. See the photo.
PRECIPITATION
Precipitation occurs when so much water has condensed that the air cannot hold it anymore. The clouds get heavy and water falls back to the earth in the form of rain, hail, sleet or snow
Different types of *precipitation
COLLECTION
When water falls back to earth as precipitation, it may fall back in the oceans, lakes or rivers or it may end up on land. When it ends up on land, it will either soak into the earth and become part of the “ground water” that plants and animals use to drink or it may run over the soil and collect in the oceans, lakes or rivers where the cycle starts all over again.
- *Surface run-off: the excess of rainflows over the land
- *Infiltration/Percolation (groundwater flow or groundwater recharge): processwhere water moves downward from surface water to groundwater.
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