Bobby.
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Australian Politics
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Melbourne
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AI Overview
The work starting in 1906 and developed post-WWII, particularly the discovery of polar reversals and ocean floor creation at mid-ocean ridges, is primarily attributed to the work of Harry Hess and others involved in mapping the ocean floor after WWII. His work, alongside that of Marie Tharp, revealed the Mid-Atlantic Ridge and led to the understanding of seafloor spreading and its implications for plate tectonics.
Elaboration:
Early Work: In the early 20th century, scientists began using sonar to map the ocean floor, revealing the presence of massive underwater mountain ranges, including the Mid-Atlantic Ridge.
Post-WWII Discoveries:
After World War II, the mapping efforts intensified, and data from sonar-equipped vessels revealed the details of the ocean floor.
Hess's Contributions:
Harry Hess and others, including Marie Tharp, used this data to create detailed maps of the ocean floor.
Seafloor Spreading:
Hess proposed the theory of seafloor spreading, suggesting that new oceanic crust forms at mid-ocean ridges and spreads away from them, driven by mantle convection.
Polar Reversals:
The study of magnetic anomalies in the seafloor revealed that the Earth's magnetic field had reversed polarity multiple times in the past, providing further evidence for seafloor spreading and plate tectonics.
Plate Tectonics:
The combination of seafloor spreading, polar reversals, and other geological evidence led to the development of the theory of plate tectonics, which revolutionized our understanding of Earth's processes.
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