Heat generated from the radioactive decay of elements deep in Earth's interior creates magma or superheated molten rock in the asthenosphere. Using a method of heat transfer (conduction, convection, or radiation), explain how the super hot magma is transferred up to the Earth's crust, creating the currents you see here.
A) Heat energy produced in the core radiates up through the magma. The heat energy forces the warming magma upward toward the crust. When the magma cools, it sinks back down toward the core.
B) Heat energy is conducted up through Earth's layers. The metallic minerals within the layers are excellent conductors of heat. As the heat energy travels through the rock, some melts and rise up to the crust.
C) The super-heated magma creates convection currents by a combination of radiation and convection. Heat radiates through the magma. Some magma melts because of its chemical composition and flows or convects up to the crust.
D) The deep, hot magma becomes less dense than the cooler, upper mantle rocks and it rises. At the same time, the magma close to the surface cools and sinks to replace the rising magma: this movement creates convection currents.