
1) Adventurer 2) Explorer 3) Non-SI metric unit 4) Otto neumann sverdrup
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https://www.crosswordclues.com/clue/sverdrup

The sverdrup, named in honour of the pioneering oceanographer Harald Sverdrup, is a unit of measure of volume transport. It is used almost exclusively in oceanography, to measure the volumetric rate of transport of ocean currents. Its symbol is Sv. Note that the sverdrup is not an SI unit, and that its symbol conflicts with the sievert`s symbol. ....
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http://en.wikipedia.org/wiki/Sverdrup
[crater] Sverdrup is a lunar crater that is located about one crater diameter from the southern pole of the Moon. It lies on the far side of the Moon with respect to the Earth, in an area of the surface that is only illuminated by very oblique light from the Sun. The interior part of the crater is cloaked in perpetual darkness, and thus has...
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http://en.wikipedia.org/wiki/Sverdrup_(crater)

[
n] - Norwegian explorer who led expeditions into the Arctic (1855-1930)
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http://www.webdictionary.co.uk/definition.php?query=Sverdrup
Otto Neumann Sverdrup noun Norwegian explorer who led expeditions into the Arctic (1855-1930)
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https://www.encyclo.co.uk/local/20974

1855?–1930, Norwegian explorer of the Arctic. · Also calleda group of islands in the N Northwest Territories of Canada, in the Arctic, W of Ellesmere Island: named after Otto Neumann Sverdrup.
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https://www.infoplease.com/dictionary/sverdrup
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