Water

Air
Water, a source of life. Water became an important part of a life. Indeed water is a constituent element of the human body's most dominant. water became an important part of life.

Water is very diverse kinds, depending on where the source and origin, such as tears from the eyes, the rain water from the sky, sea water, waterfalls, and many others. But we realize that sometimes we do not have a concern for keeping it clean and do not endanger our lives. Under certain conditions water became a source of harm.

Excessive amount of water that would be a disaster is usually called a flood, the water is not sterile also be harmful to health, contaminated water also will be a disaster. And also if small amounts of water would be a disaster such as drought and so forth.

Then it becomes necessary to keep the water to support human life, with the level of cleanliness and sterility, nor melalpaui lower limit and upper limit of human needs.

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