One of the Principal Difficulties in Establishing the Theory of Continental

question 582

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 do we now believe to be the direct source of such energy?

• A) radioactive decay
• 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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