Building a dam to produce hydro-electricity power is one way to take advantage of a common renewable resource. this produces much less pollution than a coal burning plant. however, building dams is not a perfect solution. what is one problem related to dams?

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 likelyhappened? 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.