Exploring Under the EarthAn explanation of geophysics which describes how the earth was formed and how geology became a science. |
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active volcanoes Aristotle Atlantic basalt became began beneath Canadian Shield caused changes cloud coast compass needles continental shelves continental slope continents cooled core samples cracks crater deep depth diagram disk dynamo earth earth's crust earth's magnetic field earthquake Elsasser Eratosthenes eruption Eventually explosions fault snapped feet fire flat flood folded mountains forces gases geologic geologist geophysicists geosyncline glacier globe granitic heat hundred miles idea igneous iron island land masses layers magma magnetic pole mantle material melting Mid-Atlantic Ridge million years ago molten moun mountain-building North America north magnetic pole Ocean basin ocean floor oxygen Pacific Ocean particles Pelée planet planetesimals pressure quake rain result ridges rift rise scientists sea floor sedimentary rocks sediments seismograph seismologist shallow shelves shows solid steam strata surface tain temperature theory thousand tion trenches tsunami turbidity currents undersea vast Vesuvius volcanic mountains volcano water vapor wedges Wegener