The Theory of Sea Floor Spreading

Page 1 <img data-url='document/the-theory-of-sea-floor-spreading.html?page=1' data-page='1' class='cut-thumb lazyload' alt='Page 1: The Theory of Sea Floor Spreading' loading='lazy' src='data:image/gif;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAADUlEQVR42mNk+P+/HgAFhAJ/wlseKgAAAABJRU5ErkJggg==' data-src='https://reader035.cupdf.com/reader035/viewer/2022062411/568163c7550346895dd4fa38/html5/thumbnails/1.jpg' width='140' height='200' /> The Theory of Sea Floor Spreading

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Page 2 <img data-url='document/the-theory-of-sea-floor-spreading.html?page=2' data-page='2' class='cut-thumb lazyload' alt='Page 2: The Theory of Sea Floor Spreading' loading='lazy' src='data:image/gif;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAADUlEQVR42mNk+P+/HgAFhAJ/wlseKgAAAABJRU5ErkJggg==' data-src='https://reader035.cupdf.com/reader035/viewer/2022062411/568163c7550346895dd4fa38/html5/thumbnails/2.jpg' width='140' height='200' /> Sea Floor Spreading

• Harry Hess (1960)

• as the ocean floor spreads apart, new crust material rises from the mantle and creates new sea floor to fill the “hole.”

Page 3 <img data-url='document/the-theory-of-sea-floor-spreading.html?page=3' data-page='3' class='cut-thumb lazyload' alt='Page 3: The Theory of Sea Floor Spreading' loading='lazy' src='data:image/gif;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAADUlEQVR42mNk+P+/HgAFhAJ/wlseKgAAAABJRU5ErkJggg==' data-src='https://reader035.cupdf.com/reader035/viewer/2022062411/568163c7550346895dd4fa38/html5/thumbnails/3.jpg' width='140' height='200' /> Page 4 <img data-url='document/the-theory-of-sea-floor-spreading.html?page=4' data-page='4' class='cut-thumb lazyload' alt='Page 4: The Theory of Sea Floor Spreading' loading='lazy' src='data:image/gif;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAADUlEQVR42mNk+P+/HgAFhAJ/wlseKgAAAABJRU5ErkJggg==' data-src='https://reader035.cupdf.com/reader035/viewer/2022062411/568163c7550346895dd4fa38/html5/thumbnails/4.jpg' width='140' height='200' /> HESS (1960)• Sea floor spreading • Continents were moving (as Wegener had proposed)• Evidence1.2.3.

Page 5 <img data-url='document/the-theory-of-sea-floor-spreading.html?page=5' data-page='5' class='cut-thumb lazyload' alt='Page 5: The Theory of Sea Floor Spreading' loading='lazy' src='data:image/gif;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAADUlEQVR42mNk+P+/HgAFhAJ/wlseKgAAAABJRU5ErkJggg==' data-src='https://reader035.cupdf.com/reader035/viewer/2022062411/568163c7550346895dd4fa38/html5/thumbnails/5.jpg' width='140' height='200' /> 1. The discovery of the Mid-ocean Ridge

• Scientists mapped 47,000 miles of underwater volcanic ridges by using sonar

Page 6 <img data-url='document/the-theory-of-sea-floor-spreading.html?page=6' data-page='6' class='cut-thumb lazyload' alt='Page 6: The Theory of Sea Floor Spreading' loading='lazy' src='data:image/gif;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAADUlEQVR42mNk+P+/HgAFhAJ/wlseKgAAAABJRU5ErkJggg==' data-src='https://reader035.cupdf.com/reader035/viewer/2022062411/568163c7550346895dd4fa38/html5/thumbnails/6.jpg' width='140' height='200' /> Map of Mid-ocean Ridges

Page 7 <img data-url='document/the-theory-of-sea-floor-spreading.html?page=7' data-page='7' class='cut-thumb lazyload' alt='Page 7: The Theory of Sea Floor Spreading' loading='lazy' src='data:image/gif;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAADUlEQVR42mNk+P+/HgAFhAJ/wlseKgAAAABJRU5ErkJggg==' data-src='https://reader035.cupdf.com/reader035/viewer/2022062411/568163c7550346895dd4fa38/html5/thumbnails/7.jpg' width='140' height='200' /> 2. Ocean floor shows Magnetic Poles reversing

Page 8 <img data-url='document/the-theory-of-sea-floor-spreading.html?page=8' data-page='8' class='cut-thumb lazyload' alt='Page 8: The Theory of Sea Floor Spreading' loading='lazy' src='data:image/gif;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAADUlEQVR42mNk+P+/HgAFhAJ/wlseKgAAAABJRU5ErkJggg==' data-src='https://reader035.cupdf.com/reader035/viewer/2022062411/568163c7550346895dd4fa38/html5/thumbnails/8.jpg' width='140' height='200' /> 3. Ocean floor samples—older crust is further away from ridges