10 most difficult oceans riddles

In the 19th century, there were no clear borders defined between Peru, Bolivia and Chile in the area of the Atacama desert. This became a problem with the discovery of valuable sodium nitrate deposits in the area.

The phrase "Bermuda Triangle" was first used by Vincent Gaddis in the cover article for the 1964 February issue of the magazine Argosy. His stories and statements on the Bermuda Triangle have been criticized for being inaccurate and misleading. He has also drawn strong criticism for ignoring possible natural explanations and inventing mysteries where none exist.

Sable Island is believed to have formed from a terminal moraine deposited on the continental shelf near the end of the last Ice Age. It emerges from vast shoals and shallows which, in tandem with frequent fog and sudden storms, have caused over 350 recorded shipwrecks

There is only one ahu (group of statues), Ahu Akivi, with moai facing the ocean. It is unusual also by being one of the few inland ahus. At all other ahus (including all coastal ones) moai face inland.

A tsunami is a series of waves in a water body caused by the displacement of a large volume of water, generally in an ocean or a large lake. Earthquakes, volcanic eruptions and other underwater explosions have the potential to generate a tsunami. The word originated in Japan, and is a combination of two words: tsu (which means "harbor") and nami (which means "wave").

Arafura sea is warm and shallow. During the last ice age, the sea was dry and formed a bridge for humans to reach Australia.

Beaufort scale force 12 is the strength of the hurricane: huge waves, air filled with foam and splashes, sea completely white.

Sir William Robert Patrick "Robin" Knox-Johnston is an English sailor. In 1969 he became the first person to perform a single-handed non-stop circumnavigation of the globe and was the second winner of the Jules Verne Trophy, together with Sir Peter Blake. For this, they were awarded with the ISAF Yachtsman of the Year award. In 2007 he became, at 67, the oldest yachtsman to complete a round the world solo voyage in the Velux 5 Oceans Race.

Launched June 10, 2011, Aquarius is NASA’s first satellite instrument specifically designed to study the salt content of ocean surface waters. The complete first year dataset of NASA's Aquarius instrument reveals seasonal changes in the Amazon River's plume. Depending on the prevailing currents, the river's freshwater outflow heads east toward Africa or bends up north to the Caribbean.

Mexico's coastline measures 9,330 kms; Italy's is 7,600 kms; Brazil's is 7,491 kms, and Turkey's 7,200 kms.