Question

Two metal blocks that have slightly different temperatures are placed next to one another. After five minutes, they both have lower but equal temperatures. According to the law of conservation of energy, what most likely happened?

Energy was created inside the blocks.
Energy was destroyed inside the blocks.
Energy was absorbed into the blocks from outside the system.
Energy was transferred from the warmer block to the cooler block.

Answer 1

Energy was transferred from the warmer block to the cooler block.
Some energy was also absorbed by the outside system. If energy was only transferred between the 2 blocks (a closed system), one would have a slightly higher temperature after a while.