conduction in the ocean convection in the mantle radiation from the solid core evaporation at mid-ocean ridges
I am hesitating between 4 options to answer the following question, which option should I choose?
Question: Heat from deep in Earth's interior is transferred to its crust by which of the following?
Possibilities:
- conduction in the ocean
- convection in the mantle
- radiation from the solid core
- evaporation at mid-ocean ridges

convection in the mantle