Which of the Following Is Not Part of the Accepted

question 19

Multiple Choice

Which of the following is not part of the accepted driving mechanism of plate tectonic motions?

• A) The Earth's unequal distribution of internal heat is what drives the mantle convection and provides the heat engine.
• B) All of the heat for the mantle convection comes from small amounts of radioactive elements in the inner core.
• C) Solid state convective flow in the rocky mantle, warm regions rising and cold regions sinking, is the basic driving force for plate motions.
• D) Oceanic plates descend and constitute the downward- moving portion of Earth's internal convective flow.

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