One of the Principal Difficulties in Establishing the Theory of Continental

question 259

Multiple Choice

One of the principal difficulties in establishing the theory of continental drift (the idea that tectonic plates drift around on Earth's surface) was identifying a source of energy capable of powering such movement. What is now believed to be the source of such energy?

• A) neutrinos interacting with Earth's interior
• B) heat trapped by the greenhouse effect
• C) hot material welling up from Earth's interior
• D) the tidal pull of the Moon and the Sun

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