The most active tectonic regions of North and South America are on the

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The western coasts of North and South America are where the most active tectonic regions are located. Both regions are part of the Pacific Ring of Fire, which is known for its volcanic activity and frequent earthquakes. This is due to the movement of tectonic plates along the western boundary of the Americas, where the Pacific Plate is subducting underneath the North and South American Plates.

The Most Active Tectonic Regions of North and South America