Using the graph below, at what depth does the thermocline begin?

a line graph relating ocean depth to water temperature. at 0 meters, temperature is approximately 27°c. at 50 meters, temperature is approximately 24°c. at 100 meters, temperature is approximately 11°c. at 150 meters, temperature is approximately 8°c.

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0 meters
50 meters
100 meters
150 meters

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.