Which of these would be indications that a given mountain range was not formed by subduction? Check all that apply. \( \square \) A. There are no volcanoes. \( \square \) B. There are glacial caps. \( \square \) C. It is not along an ocean coastline. \( \square \) D. There are deep valleys.

If a mountain range shows no signs of volcanic activity, such as the absence of volcanoes, it's a strong indicator that it was likely not formed by subduction, which typically creates volcanic arcs. Glacial caps may also suggest that the region has a colder climate and has been shaped more by erosion than intense tectonic action associated with subduction zones. Additionally, if the range is not situated along an ocean coastline, it might indicate a formation through other geological processes like continental collision or uplift rather than subduction, which is inherently linked to oceanic crust interacting with continental crust. Deep valleys can also be a sign of erosion or rifting rather than subduction processes specifically.