development of the continental drift theory Earthquakes Developing the Theory De ontwikkeling van de theorie van plaattektoniek http://pubs.usgs.gov/gip/dynamic/developing.html This Dynamic Earth: The Story of Plate Tectonics Sea-Floor Spreading “Developing the theory” USGS Sea-Floor Spreading Sea-Floor Spreading helping to understand plate tectonics! paralleled by matching magnetized "stripes Developing the theory [This Dynamic Earth, USGS] Sea-Floor Spreading http://pubs.usgs.gov/gip/dynamic/developing.html Developing the theory [This Dynamic Earth, USGS] Sea-Floor Spreading Continental Drift Sea-Floor Spreading Source This Dynamic Earth: The Story of Plate Tectonics Sea-Floor Spreading Sea-Floor Spreading Continental Drift De ontwikkeling van de theorie van plaattektoniek USGS https://pubs.usgs.gov/gip/dynamic/developing.html http://pubs.usgs.gov/gip/dynamic/developing.html Magnetic striping and polar reversals Developing the theory [This Dynamic Earth, USGS] This Dynamic Earth: The Story of Plate Tectonics paralleled by matching magnetized "stripes Seafloor Spreading - USGS Sea-Floor Spreading