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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.
The deuterium to hydrogen ratio for ocean water on Earth is known very precisely to be (1.5576 ± 0.0005) × 10 −4. [35] This value represents a mixture of all of the sources that contributed to Earth's reservoirs, and is used to identify the source or sources of Earth's water.
Fresh water is the water resource that is of the most and immediate use to humans. 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.
The findings challenge the existing theory that the planet was completely covered by ocean four billion years ago.
A case could be made this colorless, odorless liquid is the most important substance on Earth. Without water there is no life as we know it. When we explore off planet it’s the first thing we ...
Billions of people around the world rely on freshwater resources that have been dwindling in recent years Freshwater supplies are ‘abruptly’ depleting across the globe, NASA warns Skip to main ...