During an oceanic plate convergence, the plate will sink.
The West Coast of the United States has features formed by .
During the of two tectonic plates, magma fills the space between the plates.
The only volcanic activity that's not formed at tectonic plate boundaries is .
Respond to the following based on your reading.

Why does underwater hot-spot volcanism tend to form chains of islands? For that matter, why doesn't it form one huge, single island?