In an undisturbed sequence of sedimentary rocks,younger layers overlie older layers,according to the principle of ________. 
Definitions:
Premium Refrigerators
Refer to high-end refrigerators that offer advanced features, superior performance, and stylish design, targeting consumers willing to pay a higher price for quality and functionality.
Competition
The rivalry among businesses or individuals for resources, markets, or achievements, driving innovation and efficiency.
Developmental Sequence
The ordered progression of events or stages in the growth and development of an organism or system.
Stages
Discrete phases or steps within a process or development sequence, each characterized by particular features or outcomes.
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