Which of the following statements is true?
sound waves create areas of high and low pressure.
areas of high pressure are called compressions.
areas of low pressure are called rarefactions.
all of the above.

2. how is heavy water different from normal water

When a septic tank backs up a goes in to clean it out

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.