What is the most likely cause of the volcanic and earthquake activity in this region

Most earthquakes are along the edges of tectonic plates. This is where most volcanoes are too. However, most earthquakes are caused by the interaction of the plates not the movement of magma . Most earthquakes directly beneath a volcano are caused by the movement of magma.

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philippine sea

explanation:

it has an area over 2 million square feet

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answer; i believe the correct answer is ; large pieces of pangaea drifted in different directions over millions of years;