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Typically, fresh water is defined as water with a salinity of less than 1% that of the oceans – i.e. below around 0.35‰. Water with a salinity between this level and 1‰ is typically referred to as marginal water because it is marginal for many uses by humans and animals. The ratio of salt water to fresh water on Earth is around 50:1.
The entire ocean, containing 97% of Earth's water, spans 70.8% of Earth's surface, [8] making it Earth's global ocean or world ocean. [23] [25] This makes Earth, along with its vibrant hydrosphere a "water world" [43] [44] or "ocean world", [45] [46] particularly in Earth's early history when the ocean is thought to have possibly covered Earth ...
The remaining 30% is ground water, 1% surface water (covering only 2.8% of Earth's land) [199] and other small forms of fresh water deposits such as permafrost, water vapor in the atmosphere, biological binding, etc. [200] [201]
The ocean contains 97% of Earth's water, and oceanographers have stated that less than 100% of the World Ocean has been explored. [5] The total volume is approximately 1.35 billion cubic kilometers (320 million cu mi) with an average depth of nearly 3,700 meters (12,100 ft).
They range in size variably, but on average measure 53–64 cm (21–25 in) in length, have a wingspan of 103–117 cm (3.38–3.84 ft) and weigh 0.63–1.4 kg (1.4–3.1 lb). [56] The Henst's goshawk (Accipiter henstii) and Meyer's goshawk (Accipiter meyerianus) do rival it in terms of wing size and body mass.
This is one of a series of comprehensive lists of continents, countries, and first level administrative country subdivisions such as states, provinces, and territories, as well as certain political and geographic features of substantial area. [1]
The largest species in this subgenus is the black-palmed rock monitor (Varanus glebopalma), reaching the maximum size of 397 mm (15.6 in) and 1.1 m (3.6 ft) for SVL and total length respectively (an average mass constitute 240 g (8.5 oz) with a SVL of 290 mm (11 in), for the max.size much higher). [10] Another big member of this group is ...
The first recorded evidence of water depth measurements are from Ancient Egypt over 3000 years ago. [3] Bathymetry has various uses including the production of bathymetric charts to guide vessels and identify underwater hazards, the study of marine life near the floor of water bodies , coastline analysis and ocean dynamics , including ...