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HYDROSPHERE (WATER POLLUTION (Human activity can alter the composition of…
HYDROSPHERE
DEFINITION
The hydrosphere is the combined mass of water found on, under and above the surface of the Earth. The water can be in any of the three physical states: gas, liquid or solid.
STRUCTURE
We also call the Earth "The Blue Planet".
Almost 3/4 of the Earth is covered by water.
Almost all of it is salt water, we humans can
only use a very small proportion. The planet
is full of water, but the proportion of it which
is suitable for consumption is not much.
WATER CYCLE
The water in the planet can be retained in the mentioned elements for shorter or longer periods, but is continously changing from one to the other. The water changes in state, and changes it's position. These changes are called the water cycle.
COMPOSITION
Of course, the composition of the hydrosphere is water. However, we can considerdifferent components or elememts or "types of places" in what we can find water. It is very useful to organize them according to their physical state:
GAS: found in the atmosphere we can considered as part of it. It's completely transparent but if you can see it it's because the water as condensed into small floating drops.
LIQUID: under the climatic conditions in most areas of the planet the water is liquid forming: rivers, lakes, oceans,etc...
SOLID: solid water is ice, mostly found in glaciers.
WATER AS A RESOURCE
A resource is any kind of matter or energy we humans can use. Water is one of the most important resources in all human societies. It is obviously used for human nutrition, but
also for the production of many factories and for the production of food. In the world, almost 80% of the fresh
water we humans use is for agriculture.
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WATER POLLUTION
Human activity can alter the composition of water with pollutants. Some pollutants of the water are:
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Water treatment
When water is polluted, we need to recover it. First, because it is our moral duty. Second, because the water is an extremely important resource. There are two important terms:
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