What device do scientists use to map the ocean floors?

What device do scientists use to map the ocean floors?
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In the event of an earthquake and you're in a 20 storey building, Is your chance of survival higher at a the higher floors or lower floors.

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There was a circular building with three floors. On the first floor lived elderly Mr. Davis and Mrs. Davis. On the second lived a newly-married couple, Sam and Jenny. On the third floor lived Katy, a college student. One day, Mrs. Davis was found dead in their apartment. Mr. Davis decided to question his roommates. Upon questioning , Sam said he was relaxing in a corner of the room while drinking his favorite coffee drink. Jenny said she was applying makeup and getting ready for her high-school reunion. Katy said she was studying for her upcoming exams on Face Time with her friend. Who murdered Mrs. Davis? -Riddles

Description : There was a circular building with three floors. On the first floor lived elderly Mr. Davis and Mrs. Davis. On the second lived a newly-married couple, Sam and Jenny. On the third floor lived ... was studying for her upcoming exams on Face Time with her friend. Who murdered Mrs. Davis? -Riddles

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Last Answer : answer:

Which office building has 5 sides, 5 floors above ground, 5 ring corridors per floor and a 5-acre central plaza that is known as “ground zero.”?

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