When did plate tectonics begin on Earth?
Earth is the only planet in the solar system known to have active plate tectonics. When did this process start, and what triggered it?
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Earth Sciences
Geology, meteorology, oceanography and climate
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How do earthquakes occur?
What is the mechanism that causes the ground to shake during an earthquake? What is the role of tectonic plates and fault lines?
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Where do ocean currents come from, and why do they matter?
The oceans circulate in large-scale currents that influence climate around the world. What drives these currents, and what would happen if they stopped?
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Why does time pass more slowly at high speeds?
Special relativity predicts that a clock moving at high velocity ticks more slowly than a stationary one. Why does this happen, and has it been experimentally confirmed?
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