3. In the Pacific Ocean, there is a plate boundary between two tectonic plates: the Pacific Plate, which contains some of
the oldest oceanic crust on Earth, and the Mariana Plate. The Mariana Trench, the deepest oceanic trench on Earth,
is located at this boundary. Nearby, there is an arc of volcanic islands called the Mariana Islands. Based on this
information, what type of plate boundary is this? How do you know?