The Aleutian Trench is formed by the subduction of the Pacific Plate underneath the North American Plate along the coastline of Alaska. What would most likely be
observed at this tectonic boundary? (3 points)
1) Chasms reaching the mantle are caused by two tectonic plates moving away
from each other
2) Creation of new seafloor formed from the solidification of magma between
the plates
3) Explosions underneath the Earth's crust caused by the collision between two
tectonic plates
4) Frequent earthquake activity caused by the movement of tectonic plates
against each other