Final answer:
The seismic and volcanic activity in the Pacific Ring of Fire is caused by the constant movement of tectonic plates in convergent and transform plate boundaries.
Explanation:
The cause of the activity seismic and volcanic in the Pacific Ring of Fire is primarily due to the constant movement of the tectonic plates along the Pacific Ocean basin. This region is where convergent and transform plate boundaries intersect, leading to a high level of tectonic activity resulting in earthquakes and volcanic eruptions.
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