Question
at travels in slow convection currents of solid materials within Earth's mantle. Heat that rises in these currents
A. Is a by-product from the decay of Earth's radioactive isotopes.
B. Is a by-product of frictional forces between Earth's tectonic plates as they slide past one another.
C. Is provided externally by the sun.
• D. is provided externally by gravitational energy in the Solar System.
Answer
B. Is a by-product of frictional forces between Earth's tectonic plates as they slide past one another.