Final answer:
The type of thermal energy transfer in each scenario is conduction or convection.
Step-by-step explanation:
The type of thermal energy transfer involved in the following scenarios are:
A. Ice cube melting on a non-conducting plate: This is an example of conduction, as the heat is transferred through direct contact between the ice cube and the plate.
B. Warm water mixing with cold water: This is an example of convection, as the heat is transferred through the movement of the fluid (water).
C. Ice cube melting in water: This is an example of conduction, as the heat is transferred through direct contact between the ice cube and the water.