fitz6.files. viewWhat did Harry Hess discover? How did he discover it? Sea-floor Spreading. What is it? Where does it happen? How does it happen? What does it do? Evidence for His Discovery. Molten Material. How was it found? What did it show? Magnetic Strips. What is this? How did it happen? What does it show? Drilling Samples. What are these?

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    20-Mar-2018

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