One ice cube is placed on a metal block. An identical ice cube is placed on a plastic block. The blocks are left next to each other on a table in a laboratory.
Which ice cube melts first and why?

1 )
The ice cube on the plastic block melts first because plastic is a good insulator of thermal energy.
2 )
The ice cube on the plastic block melts first because plastic is a good conductor of thermal energy.
The ice cube on the metal block melts first because metal is a good conductor of thermal energy.
4 )
The ice cube on the metal block melts first because metal is a good insulator of thermal energy.
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