Movement of Continents (Grade 10 NSC Matric Geography): Flashcards
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Continental drift theory
Continental drift theory
Continents move over time by drifting on Earth's mantle
Scientist who proposed continental drift in 1915
Scientist who proposed continental drift in 1915
Alfred Wegener
Pangaea
Pangaea
Supercontinent 180 million years ago with all continents joined
Two landmasses Pangaea split into 175M years ago
Two landmasses Pangaea split into 175M years ago
Laurasia (north) & Gondwanaland (south)
Fossil evidence for continental drift
Fossil evidence for continental drift
Identical fossils on continents now separated by oceans
Appalachian Mountains rock match
Appalachian Mountains rock match
Britain & Scandinavia - same age/composition
Ice age evidence for continental drift
Ice age evidence for continental drift
Ice erosion on southern continents shows they were near S Pole
Magnetic field evidence for drift
Magnetic field evidence for drift
Iron minerals in same-age rocks point different directions
Seafloor spreading evidence
Seafloor spreading evidence
New crust at ridges; youngest rocks nearest, older rocks away
Continental drift acceptance period
Continental drift acceptance period
1960s when new technology provided supporting evidence