Final answer:
The terms 'Inner Western Arc,' 'Middle Arc,' and 'Outer Arc' are not standard scientific terms and cannot be accurately described with the information provided. Instead, we discussed the Earth's structure and related tectonic activity in geographic regions like the American Southwest and the Pacific Coast, which could give rise to similar concepts in a non-standard context.
Step-by-step explanation:
The terms "Inner Western Arc," "Middle Arc," and "Outer Arc" possibly refer to layers or sections within a specific geological or geographic context, such as the earth's interior or tectonic features. However, the information provided is insufficient to accurately describe these terms, as they do not commonly appear in standard scientific lexicon regarding the Earth. Instead, let's discuss the general structure of the Earth and a geographical region that can present tectonic features which may relate loosely to the concepts of inner, middle, and outer 'arcs.'
The Earth's interior consists of different layers: the crust, the mantle, the liquid outer core, and the solid inner core. These layers can be observed through seismic studies, which reveal how earthquake waves travel through Earth.
In terms of geography, the tectonic activity along the Pacific Ocean's Ring of Fire affects various regions differently. For instance, the American Southwest, the Mountain West, and the Pacific Coast are part of larger physiographic provinces in the USA. These areas exhibit signs of tectonic activity such as earthquakes and volcanism, which could be divided conceptually into an inner area nearer to tectonic activity, a middle area with varying effects, and an outer area experiencing fewer tectonic events. However, these terms are not standard geographic classifications.