A scientist places a strip of hot metal on top of a block of another metal with a lower melting point. The second metal quickly melts. What is the main type of heat transfer responsible?

Convection, because the metals touch and cold from the block moves to the warmer strip of metal, cooling it down

Conduction, because both metals are in the sun and melt as the sun's rays heat them

Convection, because heat from the strip of metal heats the air around it, and then that warm air heats the metal block

Conduction, because the heat energy is absorbed by the metal atoms in the block. Once they have absorbed enough energy, they become liquid