Oceans

What do ship captains use to help them know when it is safe to dock at the ocean's edge?

More Questions from Oceans
How many inches long is the average tooth of an adult Orca or Killer Whale?
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What ocean did Ferdinand Magellan name?
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How many engines did the Titanic have?
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Where does the female marine catfish lay her eggs?
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Which of the following foods are most commonly eaten by sperm whales?
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What would you call a long, snake-like fish that has circular gills?
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What did early ocean scientists use to measure the distance to the ocean floor?
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40% of the hurricanes that occur in the United States hit where?
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