Continental Drift: Wegener's Revolutionary Rejected Theory
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Continental Drift: Wegener's Revolutionary Rejected Theory
Alfred Wegener's Bold Scientific Hypothesis Evidence, Rejection, and Ultimate Vindication Year 10 Earth Science
Learning Objectives
Understand Alfred Wegener's continental drift theory Examine the evidence Wegener used to support his hypothesis Analyze why the scientific community initially rejected his theory Explore the challenges faced by revolutionary scientific ideas
Who Was Alfred Wegener?
German meteorologist and geophysicist (1880-1930) Arctic explorer and researcher Proposed continental drift theory in 1912 Died during Greenland expedition
Think About This...
Look at a world map. Do you notice anything unusual about the shapes of the continents? What patterns do you see when you look at the coastlines of different continents?
The Continental Drift Theory
All continents were once joined in a supercontinent called 'Pangaea' Continents slowly drifted apart over millions of years Continents continue to move today Published in 'The Origin of Continents and Oceans' (1915)
Pangaea to Present Day
Evidence 1: Continental Fit
Coastlines of continents appear to fit together like puzzle pieces Most obvious between Africa and South America Also works for other continental margins Statistical analysis showed 'fit' was too good to be coincidence
Evidence 2: Fossil Correlation
Identical fossils found on different continents Mesosaurus: freshwater reptile found in Africa and South America Glossopteris: plant fossils across southern continents These organisms could not have swum across oceans
Evidence 3: Rock Formation Matches
Similar rock types and ages across ocean basins Mountain ranges line up across continents Appalachian Mountains (North America) match Caledonian Mountains (Europe) Same geological structures and mineral deposits
Evidence 4: Climate Clues
Glacial deposits in now-tropical regions Coal deposits in Antarctica Desert rock formations in wet climates Evidence of past climates doesn't match current locations
Puzzle Activity
Work in pairs with a world map Cut out the continents along their coastlines Try to fit them together like puzzle pieces Discuss what you observe with your partner
Critical Thinking
If Wegener had such compelling evidence, why do you think his theory was rejected? What might scientists have found difficult to accept about continental drift?