Final answer:
The 2 main causes of convection in the asthenosphere are density and temperature.
Step-by-step explanation:
The 2 main causes of convection in the asthenosphere are density and temperature. Convection is the movement of material due to differences in density caused by temperature variations. In the asthenosphere, the hotter and less dense material rises towards the surface, while the cooler and denser material sinks. This convection process is responsible for the movement of tectonic plates and the formation of features like mid-ocean ridges and volcanic activity.
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