Answer:
The correct answer is 1. Oceanic crust is sliding beneath the Aleutian Islands in the North Pacific Ocean, forming the Aleutian Trench at a convergent plate boundary between the Pacific Plate and the North American Plate.
Explanation:
The Aleutian Trench, whose name is associated with the Aleutian Islands, is an oceanic trench and subduction zone that runs from east to west along the southern coast of Alaska and the adjacent waters of northeastern Siberia, off the coast of the Kamchatka peninsula. In its eastern part it is classified as "marginal pit", forming an insular arch. The pit extends 3,400 kilometers from a triple junction with the Ulakhan Trench, in the west, at the northern end of the Kuril Trench, until its junction with the northern end of the Queen Charlotte Pit system, in the east. The Aleutian Trench is part of the boundary between two tectonic plates: the Pacific Plate slides under the North American Plate at an approximate angle of 45 degrees. In its deepest zone it reaches about 7,679 meters below sea level.
