Oceans

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

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What is oceanic crust?
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Typically a tsunami is caused by what?
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What does the beluga whales name mean in Russian?
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What is a group of seals commonly know as?
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The Philippines is part of what area around the Pacific Ocean that has many volcanoes and earthquakes?
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Which of these is the smallest of the world's oceans?
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The Irrawaddy dolphin is similar to which whale in appearance?
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What ocean contains the Gulf Stream?
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