Write and balance the equation for the combustion of coal

What happened in 2012 and how does it illustrate the importance of understanding the sun and how it works?

Which of these conditions most likely produces an unstable isotope?

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.