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200 million yr active zone Africa America continent American Cordillera Antarctica Archimedes law Atlantic Ocean breakup cirques continental crust continental drift continental plates crater crust band decrease depth Earth’s crust equatorial mantle stream equatorial stream eruption ﬁre split folds formed fragments gases geoid undulation giant Graham Land Henry law history of Gondwanaland horizontal mantle streams inﬂow Initially intermediate crust island arcs jets velocities landmasses latitudinal longitudinal mantle stream magma magmatic masses mantle ﬂow mantle jets mantle liquid mantle substrate mantle whirl mighty million yr ago model of horizontal Moon motion of mantle mountain chains mountain lands North Atlantic occurred ocean crust ocean ﬂoor crust orogenesis outﬂow overlying crust Paciﬁc Ocean plate tectonics produced ridge Scotia arc second longitudinal mantle South America South America continent southem subcrustal mantle streams subcrustal stream submeridional tensile forces thick continental crust transform faults trench tumed uplift volcanic activity westem edge