ASTR 1101 Chapter : Mar26 Continental Drift
Document Summary
!observational evidence: south american & africa (cid:1) t(cid:2) together , south american & africa fossils match , but what can move continents, atlantic sea oor spreading. Earthquakes and volcanoes de ne edges of plate boundaries! !cd (strong: plates surrounded by earthquakes, volcanoes, & mountains!cd (moderate) Overwhelming confirmation: measurement of continents moving apart (e. g. , with. Gps, laser ranging): ages of sea oor rocks get younger and younger the nearer the mid-ocean ridge, very detailed models of the physics of earth, neutrinos from radioactive decays inside earth! !observational evidence: south american & africa (cid:1) t(cid:2) together ! Improved match of fossils in south american & africa. !cd (moderate) : radioactive powered convection moves continents. !cd (strong: plates surrounded by earthquakes & volcanos & mountains!cd (moderate, plates measured to move, rock ages youngest near sea oor ridges , very detailed models of physics of earth! !cd (moderate: detect neutrinos from radioactive decay in earth"s interior !cd (strong)!
