Suppose the heating curve below is for water initially at -150°C.Describe what is happening or what process is occurring in each region (I,II,III,IV,and V)as heat is added at a constant rate. 
Definitions:
Indicated Pairs
Pairs of elements or items that are specified or identified in a particular context or problem.
Parallel
Lines or planes that are the same distance apart over their entire length, never meeting.
Points
Specific locations in space defined by coordinates in a given dimension (2D, 3D, etc.).
Indicated Pairs
Pairs of elements or numbers specified or denoted in a particular context or problem, often used in relation to graphs or sets.
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