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Most water in Earth's atmosphere and crust comes from saline seawater, while fresh water accounts for nearly 1% of the total. The vast bulk of the water on Earth is saline or salt water, with an average salinity of 35‰ (or 3.5%, roughly equivalent to 34 grams of salts in 1 kg of seawater), though this varies slightly according to the amount of runoff received from surrounding land.
Water resources are natural resources of water that are potentially useful for humans, for example as a source of drinking water supply or irrigation water. These resources can be either freshwater from natural sources, or water produced artificially from other sources, such as from reclaimed water or desalinated water (). 97% of the water on Earth is salt water and only three percent is fresh ...
Fresh water is not always potable water, that is, water safe to drink by humans. Much of the earth's fresh water (on the surface and groundwater) is to a substantial degree unsuitable for human consumption without treatment. Fresh water can easily become polluted by human activities or due to naturally occurring processes, such as erosion.
Fresh water, which is essential for life, appeared on Earth about four billion years ago – 500 million years earlier than previously thought, research suggests.
Water is the world's most consumed drink, [27] however, 97% of water on Earth is non-drinkable salt water. [28] Fresh water is found in rivers, lakes, wetlands, groundwater, and frozen glaciers. [29] Less than 1% of the Earth's fresh water supplies are accessible through surface water and underground sources which are cost effective to retrieve ...
Water can be polluted, abused, and misused but it is neither created nor destroyed, it only migrates. There is no evidence that water vapor escapes into space." [12]: 26 Every year the turnover of water on Earth involves 577,000 km 3 of water. This is water that evaporates from the oceanic surface (502,800 km 3) and from land (74,200 km 3).
Drinking milk, water, and fruit juice is also a good way to maintain hydration. However, people should bear in mind the amount of sugar that can be contained in sweetened drinks.
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