Oceans

What is the periodic rise and fall in the ocean's water level called?

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Coral reefs are largely in what ocean zone?
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Iceland is located in what ocean?
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The Great Barrier Reef lies just off what continent?
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How many engines did the Titanic have?
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Approximately where is the blowhole located on the head of a sperm whale?
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Which of the following is a major predator of sea otters?
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What type of cnidarian makes up an underwater reef?
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Where does the female marine catfish lay her eggs?
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