Plate Tectonics quiz
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Who proposed continental drift in 1912?
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More questions about Plate Tectonics
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Which city will Los Angeles border in about 15 million years?
Answer: San Francisco
Why: California will not fall into the ocean: its two plates slide sideways past each other along the San Andreas Fault.
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What is the largest tectonic plate?
Answer: Pacific
Why: Covering about 103 million square km, it carries almost nothing but ocean floor.
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How deep can the deepest sinking plates eventually go?
Answer: About 2,900 km
Why: Quakes inside sinking plates stop near 700 km, yet seismic images trace their cold remains down to the top of the core.
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Which landmass was an island before crashing into Asia?
Answer: India
Why: India raced north at about 15 cm a year, roughly twice as fast as the fastest plates move today.
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Roughly how old is the oldest Pacific Ocean floor?
Answer: 170 million years
Why: Old seafloor keeps sinking back into the mantle at trenches, while some continental rock is close to 4 billion years old.
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What force does most to move tectonic plates?
Answer: Slab pull
Why: Slab pull, the weight of a cold plate edge sinking into the mantle, is about ten times stronger than ridge push.
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