What type of feature is represented by the boundary between geologic units 2 and 3? 
Definitions:
Nonrival
A characteristic of a good or service where one person's consumption does not reduce its availability for others, often used in the context of public goods.
Efficient Price
A price level where the quantity supplied equals the quantity demanded, leading to an optimal allocation of resources.
Nonrival
A characteristic of goods where one person's consumption does not reduce the availability of the good for consumption by others.
Nonexcludable
A characteristic of a good or service where it is impossible to prevent individuals from enjoying its benefits once it is provided.
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