Determining the order of events and relative age of rocks by examining their position in a sequence is called stratigraphy.

Here's why:

* Stratigraphy is the branch of geology that studies rock layers (strata) and their relationships. It focuses on the following:

* Order of events: Understanding the sequence in which rocks formed.

* Relative age: Determining which rocks are older or younger than others, without necessarily knowing their absolute age in years.

* Principles of stratigraphy like the Principle of Superposition and the Principle of Cross-Cutting Relationships are key to establishing this order and relative age.

Let me know if you'd like a more detailed explanation of these principles!