The heat energy that powers tectonic activity on the surface of Earth originates deep in Earth's core. How does the majority of this energy move from the core to the surface?
A) conduction through the solid lower mantle and convection in the upper mantle (asthenosphere)
B) convection throughout the entire mantle
C) conduction throughout the entire mantle
D) steady flow of hot magna from Earth's core through cracks in the mantle to the lithosphere

Question

Quizplus · Accepted Answer

The majority of heat energy from Earth's core moves to the surface through conduction in the solid lower mantle and convection in the more fluid upper mantle (asthenosphere). Conduction transfers heat through direct contact of particles, while convection circulates heat as warm material rises, cools, and then sinks. This process drives tectonic activity on the surface.

The Heat Energy That Powers Tectonic Activity on the Surface