Mark can answer the physics problem because of patterns of knowledge stored in his long-term memory, which he did not intentionally try to learn. this situation involves mark using what?

Implicit memory  

Explanation:  

Implicit memory: The term implicit memory is a part of the long-term memory that can not be consciously recalled. Through implicit memory an individual can perform skills, habits, or automatic behaviors, for example, driving a car. Implicit memory allows an individual to react in certain ways for which he or she is not consciously aware of the reason for the behavior.

The Implicit memory is also referred to as automatic memory or unconscious memory. It allows a person to utilize past experiences to think about something without being consciously aware.

In the question above, Mark is using implicit memory.

answer; action;