10 Questions
What was the name of the supercontinent proposed by Alfred Wegener?
Pangaea
What evidence did Alfred Wegener use to support his hypothesis of continental drift?
Matching coastlines and mountain chains
Who created the first scientific map of the entire ocean floor?
Marie Tharp
What technology was used in the early 1900s to calculate the distance to the ocean floor?
Sonar
Why was Alfred Wegener's hypothesis of continental drift initially rejected?
"He could not explain how continents drifted apart"
What did Harry Hess use in 1960 to explain Sea-Floor Spreading?
SONAR images
What is the deepest trench on Earth located within?
Deep-Ocean Trenches
What is the Challenger Deep?
The deepest place on Earth
What process causes older portions of the ocean floor to subduct into the mantle?
Subduction
What evidence supports the theory of sea-floor spreading?
Alternating magnetic stripes in ocean-floor rock
Learn about Alfred Wegener's theory of continental drift, which proposed that all continents were once connected in a supercontinent called Pangaea, before drifting apart about 200 million years ago. Explore the evidence Wegener presented to support this revolutionary idea.
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