Water covers 75% of the earth's surface. The total amount of water on earth remains about the same from one year to the next as it circulates between the oceans, land and atmosphere in a cycle of evaporation and precipitation. This hydrological cycle is fundamental to the functioning of the earth as it recycles water, and has a role in modifying and regulating the Earth's climate.

Nearly 98% of the earth's water is in the oceans. Fresh water makes up less than 3% of water on earth, over two thirds of this is tied up in polar ice caps and glaciers. Fresh water lakes and rivers make up only 0.009% of water on Earth and ground water makes up 0.28%.

Water is essential for all life forms. For example it makes up 60 to 70% by weight of all living organisms and is essential for photosynthesis. The viability of all life on earth is determined chiefly by the presence of water.

The United States uses three times as much water a day as the average European country, and many, many times more water than most developing nations

The United States withdraws 339 billion gallons of ground and surface water a day

Roughly 70 percent of an adult’s body is made up of water.

At birth, water accounts for approximately 80 percent of an infant’s body weight.

A healthy person can drink about three gallons (48 cups) of water per day.

Drinking too much water too quickly can lead to water intoxication. Water intoxication occurs when water dilutes the sodium level in the bloodstream and causes an imbalance of water in the brain.

Water intoxication is most likely to occur during periods of intense athletic performance.

While the daily recommended amount of water is eight cups per day, not all of this water must be consumed in the liquid form. Nearly every food or drink item provides some water to the body.

Soft drinks, coffee, and tea, while made up almost entirely of water, also contain caffeine. Caffeine can act as a mild diuretic, preventing water from traveling to necessary locations in the body.

Pure water (solely hydrogen and oxygen atoms) has a neutral pH of 7, which is neither acidic nor basic.

Water dissolves more substances than any other liquid. Wherever it travels, water carries chemicals, minerals, and nutrients with it.

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