Heating curve shows temperature verses energy gain. Which parts of the curve represent a gain in potential energy? 100
Temperature (°C)
0
Increasing Energy

Those two horizontal lines.

Explanation:

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In this case, when focusing on these heating curves, it is important to say they tend to have two constant-temperature sections and three variable-temperature sections. Thus, from lower to higher temperature, the first constant-temperature section corresponds to melting and the second one vaporization, whereas the three variable-temperature sections correspond to the heating of the solid until melting, the liquid until vaporization and the gas until the critical point.

In such a way, we infer that the boxes referred to constant temperature are referred to a gain in potential energy, that is, the two horizontal lines.

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c- cold periods in earth's history during which glaciers covered much of the surface.

explanation: