What is the reason for a solidus line and a liquidus line on a pressure-temperature graph in the context of partial melting and fractional crystallization? 
Definitions:
Organic Structure
A flexible, decentralized organizational structure with low levels of formalization.
Informal Communication
The exchange of information through non-official channels, often based on personal relationships rather than organizational structure.
Innovation
The process of creating, developing, and implementing new ideas, processes, or products that are intended to improve efficiency, effectiveness, or competitive advantage.
Departmentalization
The method by which an organization divides its operations into separate units or departments based on function, product, geographic location, or customer base.
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