The heating curve for a substance is shown below. The substance initially is a solid. It then becomes a liquid and a gas. Which of the line segments (I-V) represents the solid to liquid phase transition? 
Definitions:
Managing Finances
The practice of handling one's money and financial transactions efficiently, including budgeting, saving, investing, and planning for the future.
Age Discrimination
Prejudicial treatment of individuals in employment, training, and privileges based on their age.
Racing Skills
The abilities and techniques required for competitive racing, including speed, agility, and strategic planning.
Mental Clarity
A state of having clear, focused, and sharp cognition, allowing for effective processing of information and decision-making without confusion or ambiguity.
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