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A MYSTERIOUS AND MOBILE EARTH
Probing the Deep in a Pygmy Sub
Explaining a Dynamic Earth
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200 million Africa and South Alvin Antarctica asthenosphere Atlantic Australia basalt beneath chain coast coastlines collision continental drift continental shelves convection cooling and contracting core crustal depth dive drill earth's crust earthquakes edge Eismitte evidence Ewing expedition explain feet formed fossil fracture geological geologist Geophysical geophysicist global globe Glomar Gondwana Greenland heat Heezen Hess hot spots Humboldt idea Indian Ocean Lamont land bridges land mass later Laurasia lava layer magma material Mid-Atlantic Ridge Mid-Ocean Ridge miles million years ago molten mountain ranges move North ocean basins ocean crust ocean floor ocean ridges ocean trenches oceanographic Pacific Plate paleomagnetic Pangaea planet plate movement plate tectonics rift valley rise rock samples scientific sea floor sea-floor spreading sediment seismic waves ship sinking slabs South America studies subduction suggested supercontinent surface tectonic plates Tethys theory of plate TIME-LIFE tion transform faults Tuzo University Wegener's Wilson wrote