Answer :
Final answer:
The net change of 0°C occurs when the starting and ending temperatures are the same. In the given options, this happens for -5°C to -5°C, 20°C to 20°C, and 30°C to 30°C.
Explanation:
The net change in temperature refers to the amount of difference between the starting and ending temperature. In case of no change in temperature, the net change would be 0° Celsius. From your options, the scenarios of having a net change of 0° Celsius are for options 1) -5° Celsius to -5° Celsius, 3) 20° Celsius to 20° Celsius, and 4) 30° Celsius to 30° Celsius.
Here, the initial and final temperatures are the same, thus making the net change 0°C. On the other hand, scenario 2) 10° Celsius to -10° Celsius shows a net change of -20°C, as the temperature decreased by 20 degrees.
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