What is water cycle;

What are the actions of revaporating and restarting?

What is the mechanism of cycling water?

Water cycle or hydrologic cycle is continuous cycling, as water evaporates and rises up into the air, where cooler temperatures cause it to condense and becomes part of the clouds, falls down to the earth as a precipitation and then evaporates again to the atmosphere, see hydrosphere one of earth's component.

1.    This close cycling of rising and falling repeats again and again, daily, monthly, yearly, never ending, never stopping;

2.    Water keeps moving up and down because it has the ability to change its form and state from solid to liquid to gas, over and over again.

Mechanism of cycling water:

1.    The sun is the great responsible of cycling water, because it heats water in the oceans, in the seas, in the soils, in the ices and in the snows;

2.    The molecules of the water gain sufficient heat from the sun, and then change their form and state from liquid or solid into gaseous state and then start evaporating and escaping to the atmosphere;

3.    There are another kinds of water changing into vapor, that is known as the ice or snow sublimation, in this form, water evaporates directly without passing the liquid form, this happens in the big glaciers and snow lumps;

4.    The other kind of water escaping is the evapotranspiration, here the plants take the water from the soils and transpire some of this water, which will go up to the atmosphere.

Precipitation:

1.    As the water vapors get to the atmosphere, the air currents bring these vapors everywhere around the globe, forming clouds;

2.    The cloud particles collide, grow and fall out of the upper atmospheric layers as precipitation;

3.    Some precipitation falls as snow or hail, sleet and can accumulate as ice caps and glaciers, which can store frozen water thousands of years;

4.    Most water fall back into the oceans or onto lands as rains, where the water flows over the ground as surface runoff;

5.    A portion of runoff gets into rivers, in valleys, in the landscapes, with stream flow moving water towards the oceans;

6.    Runoff and groundwater are stored as freshwater in lakes and ground faults;

7.    Some runoff water soaks into the ground as infiltration;

8.    Some water percolates deep down to the ground and replenishes aquifers, which store freshwater for long periods of time;

9.    Some infiltration stays near the land surface and can seep back into surface, water bodies like oceans as ground discharge;

10. Some groundwater finds faults and openings in the land surface and rushes out as freshwater spring;

11. By the time, the water may return to the oceans and seas.

Actions of revaporating and restarting:

1.    The water cycle has no starting point because the evaporation takes place at everywhere and every time;

2.    As it have been mentioned the main evaporation process happens from oceans and seas but it can be from the glaciers, snows, wet soils, wet grounds, plants or even from the atmosphere while falling and raining;

3.    Some water molecules regain sufficient energy during their journey down and changes to gas state and then return back to the atmosphere before touching ground.

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