Oceans

What did early ocean scientists use to measure the distance to the ocean floor?

More Questions from Oceans
The average life expectancy of a sperm whale is approximately how many years?
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How many collapsible lifeboats did the Titanic carry?
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Brine pools in the ocean have an unusually high level of what?
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The world record ice-fishing catch of a trout in 1987 was?
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The Coral Triangle mainly in Indonesia is also referred to as what?
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Which animal spawns in fresh water but lives most of its life in the sea?
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Which of the following tools would a sea otter use to get a shellfish open?
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Which of the following whales is scientifically classified as the "Eschrichltius Robustus"?
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