Question

1. why are there so many volcanoes on the western coast of the americas?

two diverging oceanic plates form the volcanoes.
there are hot spots along the western coast of the americas.
diverging plates (oceanic and continental) form the volcanoes.
two converging plates (oceanic and continental) form the volcanoes.

Explanation:

The western coast of the Americas has active volcanoes because oceanic and continental tectonic plates converge here. Denser oceanic crust subducts under lighter continental crust, melting and creating magma that rises to form volcanoes. Divergent plates or hot spots do not explain the widespread volcanoes in this region.

Answer:

Two converging plates (oceanic and continental) form the volcanoes.