A heating curve has two flat lines, or plateaus the plateau at the lower temperature represent the decrease in heating curves of a substance. option D is correct.
<h3>What are heating curves?</h3>
The heating curves are used for calculating the boiling point temperature depends on the outside atmosphere, the curve expresses how the supply temperature depends on outside temperature.
This curve mainly represents the relationship of temperature, matter, and heat which undergo phase transitions at melting and boiling points and assume a substance in the solid state lower its freezing point.
Therefore, the plateau at the lower temperature represent the decrease in heating curves of a substance. option D is correct.
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