Final answer:
The remarkable alignment of the Cascade Range is explained by modern subduction, where the Juan de Fuca and Gorda Plates are subducting beneath the North American Plate.
Step-by-step explanation:
The remarkable alignment of the Cascade Range can be explained by modern subduction. The Cascade Range is the result of subduction of the Juan de Fuca and Gorda Plates under the North American Plate. This subduction process creates a convergence of tectonic plates, leading to the formation of volcanic activity and the alignment of the Cascade Range.