Oceans

Blue whales have an extremely loud call, approximately how loud measured in decibels?

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What ocean did European explorers cross to get to the New World?
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The ratio of wave height to wavelength is the wave's what?
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Which ship was the nearest to the Titanic when the ship sank?
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What is the most poisonous fish in the world?
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Which ocean's water is the coldest?
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An octopus has how many hearts?
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Who headed the team that discovered the wreck of the Titanic?
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Which of these is not an ocean?
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