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Africa Alps Antarctica areas basaltic beneath block called Cambrian Carboniferous caused chemical Climate cone continental drift continents convection currents core crater Cretaceous crust crustal rocks dating deep deposits depth diagram distance earth earth's surface earthquake epicentre erosion eruption evidence explosion faults feet fissures folding fossils fracture geological column geologists geosyncline glaciation glaciers Gondwanaland granite Haroun Tazieff horizontal ice age ice-sheet igneous island isostatic lake land magma Magnetic Pole mantle material measured Mid-Atlantic Ridge miles per second million years ago million years old Moho Mont Pelee mountain ranges move movement nappes North America North Magnetic Pole occur ocean basins ocean floor orogeny Pacific peneplain period Photo W. J. Allen photograph pressure quakes radio-active recorded regions rift valley rise rivers rock layers rock strata sea level sedimentary rocks sediments seismograph seismologist sequence shock waves slopes South speed suggested temperature theory uplifted uranium vents volcanic activity volcanoes weathering