Oceans

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

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The longest river in Europe flows into what sea?
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Where on the Earth would oceans be warmer?
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The St. Lawrence Seaway opened in 1959 allowing oceangoing ships to reach which Minnesota city?
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Another name for the Risso's dolphin is what?
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Which lake is the second largest in the world?
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A large number of islands referred to collectively is a what?
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In the 1970's, a large and failed expansion to Florida's Osborne Reef was comprised mostly of what?
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Which term refers to the regular abnormal warming of the Pacific Ocean?
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